What was found
NR 3 ENGINE OIL PRESSURE FLUCTUATING AND UNRELIABLE. FOUND LOOSE WIRING CONNECTIONS AT THE NR 3 ENGINE PYLON GROUND TERMINAL BLOCK, R31TB, AND GROUND TERMINAL BLOCK NOT PROPERLY SECURED TO PYLON STRUCTURE. AFTER SECURING THE WIRING AND TERMINAL BLOCK A SATISFACTORY OPS CHECK WAS PERFORMED. CHECKED NR 1 AND NR 2 ENGINES GROUND TERMINAL BLOCKS AND WIRING AND FOUND TO BE SECURE. FSA-79-30-004-R00-A, DESCRIBES SAME PROBLEM WAS FOUND ON THE NR 1 ENGINE OF 1 OTHER OTHER ACFT AND APPEARED TO BE AN ISOLATED INCIDENT.