............One of our Bauer compressors (K14) has started showing air bubbles in the oil sight glass, above the oil pressure regulator adjuster. I am assuming this is an indication that the final stage suction valve is finished, but before I go take it off line for repair, could there be any other fault (reason for this) I could check first? Oil pressure is still fine, but I have noticed a slight increase in oil usage, which leads me to think the floating piston and sleeve may need replacement as well. The unit has done roughly 900 hours since its last valve change, so its not bad going, but I was hoping for a bit more hours, Bauer recons a 1000 hours is usual for the final stage valves and I got a bit more on the previous set, maybe 1300 hours before it started popping the 3rd stage safety valve. We use the unit constantly, so I would rather make sure before I have to schlep it off for repairs, any ideas would be welcome.