What was found
AT 3,000-3,500 FEET RH ENGINE OIL (PSI) FLUXUATION FROM 15 PSI TO 51 PSI, EVEN AT CRUISING POWER, C/W QRH, AIR RETURN. AIRCRAFT REMOVED FROM SERVICE. UPON FURTHER INSPECTION FOUND OIL TO BE LEAKING FROM SCAVENGER OIL FILTER HOUSING. FOUND OIL FILTER HOUSING CAP TO BE MISSING AN ORING. INSTALLED ORING IN REF AMM 79-21-05. NO LEAKS NOTED. NO DEFECTS AT THIS TIME. A/C PLACED ON DAILY OIL WATCH FOR LH ENGINE. DUE TO TAKING 10 PINTS OF OIL.