What was found
(CAN) CREW REPORTED THAT THE ENGINE OIL PRESSURE INDICATION FLICKERED AND DROPPED TO ZERO, THEN CAME BACK TO NORMAL. A SECOND FLICKER OF THE SAME NATURE REOCCURRED. THE INDICATION REMAINED NORMAL THEREAFTER. MAINTENACNE REMOVED THE EIS (ENGINE INSTRUMENTATION SYSTEM)PANEL, CLEANED PLUG P533, REINSTALLED PANEL AND SUBSEQUENT GROUND RUNS REVEALED NO FAULTS. THE EIS PANEL HAD BEEN REPLACED FOR THE SAME SNAG ON 2001-01-19 AT 1745.1 HOURS. REPLACED ON 2000-11-29 SNAG ENTERED "EIS PANEL INTERMITTENT" AT 1648.6 HOURS. REPLACED ON 2000-10-27 UNKNOW REASON AT 1532.1 HOURS..