I know this post is now 6 years old (just read this post today), but it is an example of why customers are not best equipped to service these degasser modules. This post left me sad as I know we could have professionally repaired your degasser in just 1-2 business days for a tiny fraction of the amount you ended up spending. Most HPLC degassers that we repair cost far less than refurbished replacements. Please leave it to the professional service companies like Chiralizer Services to quickly diagnose and repair these systems (not Agilent, as they do not "repair" these, they just swap parts, similar to what you did, at great cost). We repair to the component level so you do not get overcharged buying one whole module when all you need is to have one small part fixed.
When you initially reported that the vacuum chambers were flooded, that is when I knew that your degasser was damaged and replacing the pump or chambers alone would not fix it. When one or more vacuum chambers are ruptured or leaking, the mobile phase leaks into and contaminates the tubing, vacuum valve, vacuum pump and vacuum sensor. This results in damage to the entire system and results in contamination of ALL of your mobile phase while the degasser in still plumbed to your HPLC system. If you just replace one or more parts without dealing with the internal contamination, then you will simply destroy the replacement parts you install and not solve the problem. This is because the original cause of the problem was not diagnosed and understood AND, most importantly, because the system was not carefully cleaned and each component tested to determine the extent of the damage. Only then can the correct repairs be made and the system re-connected to the HPLC system.
A few related Notes:
(1) Leaving the broken degasser module connected to the HPLC may result in contamination of ALL mobile phase running through your system (if it is leaking inside the degasser and washing out all kinds of material that was never designed to come into contact with liquid). YOUR HPLC column is now contaminated and results are no longer validated. If your degassing is connected to a LC-MS system, well then your source is now contaminated too (we have seen several MS system with all kinds of mysterious peaks whose source was unknown until we pointed this out to the clients and then they disconnected the degasser (sent it to us for cleaning and repair) and starting decontaminating their MS system.
(2) Never replace HPLC degasser vacuum tubing with "auto parts store" windshield washer tubing! Never, that is a sure way to contaminate your degasser and thus, contaminate your mobile phase. Buy and use the correct type of ultra-pure grade internal vacuum tubing for this application. We can offer you the same or better quality tubing than what Agilent supplies for about half the price they charge. A small price to pay for the correct part and maintaining your system's overall quality.
(3) If you see that any vacuum chamber has an internal leak (see when there is liquid or buffer salts in one of the drain pans), please send the whole unit for repair. Do not just replace the vacuum chamber or vacuum pump as the entire system probably has damage and should be professionally cleaned first and evaluated before replacing any parts. The tiny cost to have the system professionally diagnosed will more than pay for itself in only having the services that are actually needed done, and not paying for parts or entire degasser which you do not need.
For professional HPLC Degasser testing and servicing (all brands) with fast turnaround (1-2 business days), very low prices, factory parts, professional quality work and a warranty on services, please refer to this link [http://www.chiralizer.com/hplc-degasser-repair.html ].