What was found
FLT 7701 - BOS-CMH - DURING A FERRY TO CMH, A/C WAS DIVERTED TO AVP DUE TO NR 1 ENGINE LOW OIL PRESSURE INDICATION FLUCTUATING. THE CREW PERFORMED AN IN FLIGHT SHUTDOWN. A/C LANDED SAFELY IN AVP. MAINTENANCE WAS CALLED. UPON INVESTIGATION IT HAD BEEN NOTICED THAT DURING THE PROCEDURES FOR AN MEL 29-11-1 A CAP THAT WAS TO BE INSTALLED FOR THE REMOVAL OF THE EDHP AN O-RING WAS NOT INSTALLED ON THE CAP CAUSING THE LOSS OF OIL. MAINTENANCE PUT AN O-RING ON THE CAP. OP CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (M)