As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 600 HOUR INSPECTION GREASE IN LOWER PULLEY SHAFT HAD A RUSTY (BROWN) COLOR (NOTE: ANDEROL GREASE IS BLACK). UPON INSPECTION PART HAS 600.0 HOURS SINCE NEW, THE SPLINES SHOWED IRREGULAR WEAR. SPECULATION OF MFG AND OUR FACILITY IS THAT THE GREASE WAS CONTAMINATED. FIRST 600 HOUR INSPECTION ON THIS AC, SAME GREASE SINCE DELIVERY FROM MFG. (K)