What was found
DURING CLIMBOUT, WHEN NR 1 ENGINE ANTI-ICE WAS TURNED OFF, NR 1 ENGINE COMPRESSOR STALLED ACCOMPANIED BY NR 1 OIL PRESSURE WENT TO 100 PSI AND OIL QUANTITY FLUCTUATED +/-2 GALLONS. SECURED ENGINE. ENGINE WINDMILLED ABOVE 25 PERCENT FOR 45 MINUTES. FOUND NR 1 OIL PRESSURE TRANSMITTER BAD. REPLACED OIL PRESSURE TRANSMITTER IAW DC-8 MM 79-32-01. OIL QUANTITY READ NORMAL. REMAINED STEADY ON ENGINE RUN. REMOVED AND INSPECTED NR 1 ENGINE OIL FILTER, FILTER WAS CLEAN IAW DC-8 MM 79-20-07. PERFORMED ENGINE RUN, CHECKED OPERATION OF PRBC. CHECKED GOOD. TESTED ENGINE ANTI-ICE VALVE UNDER AIRLOAD VALVES. CHECKED GOOD.