What was found
DURING CLIMB NR 4 ENG QTY DROPPED & OIL PRESS ROSE TO 60 PSI, TEMP INCREASED. POWER WAS REDUCED PARAMETERS REDUCED OIL PRESS, OIL TEMP REDUCED 20 DEGREES & OIL QTY INCREASED. OIL PRESS LIGHT NEVER ILLUM & OIL PRESS NEVER DROPPED BELOW 40 PSI. MX REMOVED & INSPECTED NR 4 ENG OIL FILTER. OIL FILTER REPLACED. MX INSPECTED ENG, NO LEAKS. ENG RESERVICED & RUN AT IDLE, NO LEAKS. ENG RUN AT PART PWR FOR 5 MINS, TAKEOFF PWR FOR 5 MINS & CLIMB PWR FOR 5 MINS. QTY CHECK OK, OIL PRESS 57 PSI, INSPECTED OIL PRESS RELIEF VALVE, NO DEFECTS. REINSTALLED VALVE. MX ADJUSTED NR 4 ENG OIL PRESS RELIEF VALVE. IDLE PRESS 39 PSI T/O POWER 52 PSI, SYS LEAK CHECK GOOD. OIL QTY INDICATING SYS OP CHECK OK.