What was found
AFTER LANDING, TAXIING CLEAR OF RUNWAY, OIL FILTER BYPASS LIGHT ILLUMINATED ON NR 1 ENGINE. ACFT GROUNDED. ACCOMPLISHED FMC/CDU TEST ON NR 1 ENGINE, SHOWED FAULT 79-31121-OIL FILTER SIGNAL DISAGREE ON LAST 6 FLIGHT LEGS. PERFORMED EEC TEST ON NR 1 ENGINE, VERIFIED SAME FAULT 79-31121 IAW AMM 73-21-00. REMOVED AND REPLACED THE NR 1 ENGINE SCAVENGE OIL FILTER, NO FAULTS NOTED ON OLD FILTER IAW AMM 79-21-06. REMOVED, INSPECTED, AND REINSTALLED ALL THREE CHIP DETECTORS, NO FAULTS NOTED IAW AMM 79-00-00. REMOVED AND REPLACED THE NR 1 ENGINE SCAVENGE OIL FILTER CLOGGING TRANSMITTER IAW AMM 79-21-07. PERFORMED TEST 3A ENGINE RUN, NO LEAKS NOTED AND OIL FILTER BYPASS LIGHT NOT ON DURING RUN. REACCOMPLISHED EEC TEST ON NR 1 ENGINE, NO FAULTS NOTED.