Hey thanks for the reply! We have since remedied the situation, sadly it wasnt something that could be fixed, just a new part had to be ordered (700 bucks ouch). We could have gotten a "for parts VIM" from ebay that we could have salvaged the part from for 500 bucks but it wasnt worth the risk.
To answer your question, and to help others who may have this issue:
Starting off, we are performing LC-MS/MS on urine samples testing for clinical drugs.
The VIM, or valve interface module, is one of the stacks we have on our LC system. After mobile phase (in our case A and B consisting of 0.1% Formic acid in water and 0.1% FA in MeOH) is pumped to the injector valve that the autosampler injects into, the sample and mobile phase go to our selector valve which is located on the VIM. The selector valves purpose is to allow multiplexing, so we can run two columns with two different methods to the LC simultaneously ( or close to simultaneously, one channel is open while the other is equilibrating the sample in the loop on the injector valve ready to pump in when scanning for the other channel finishes). It does this by a rotor in the selector valve that turns to allow different pathways to flow to waste or the MS. We started seeing nasty buildup behind the face of the valve (between the face where the plumbing connects and the rotor itself). This gunk ended up being (I think) grease from the broken bearing in the rotor. After taking it apart and turning it by hand it was rough. We tried sonicating the part to clean it but it only got rougher so Im almost certain it was the bearing broken. The reason we had high pressures is because it was not switching between channels properly, like getting stuck between two positions, not allowing the mobile phase to flow properly. Sadly the part that we replaced could not be opened up and the bearing replaced so we had to order another one from the manufacturer, in this case, from ValveCo
https://www.vici.com/.
Ill edit this and upload a photo of the VIM too for reference when i get the chance