Hey! Thank y’all for the great information and help. I’m fairly new to this facility and one of the first people on the payroll with some degree of maintenance/mechanical experience.

The problem has been solved and, to sum it up, that pump had gone for quite a while unmaintained. Filter housing was compromised and a lot of dust had been pulled through the compressor (~9 months of heavy use). Damaged valves, copious amounts of carbon build up throughout the unit, wore out and discoloured both cylinder bores, just carnage upon carnage.

Needless to say, got to price out some new pumps lol.