What was found
FLT 1620 BOS-LHR (ETOPS). DUE TO INBOUND WRITEUP OF OIL QTY ADVISORY ON ENG #1, FOUND OIL LEAKING FROM NR 4 BEARING SCUPPER DRAIN. ENG 1 OIL QTY ADVISORY ON ECAM. PERFORM IDLE POWER TEST TO CHK FOR OIL SYSTEM LEAKS. ENGINE 1 IDLE POWER TEST PERFORMED IAW AMM 71-00-00-720-811-1 REV 109. LEAK IDENTIFIED FROM NO.4 BEARING SCUPER DRAIN.) (4434784: ENG OIL QUANTITY ADVISORY ON ECAM AFTER T/O AND ON APPROACH. SHOWED 1 QT OF OIL.; TS C/O IAW TSM 71-00-00-810-846-A. UP TO SUBTASK71-00-00-810-111-A 4A 3A. NO BORSCOPES PERFORMED VISUAL INSPECTION OF ENG OIL SYS. EXTERNALLY WITH FAN COWLS+TR OPEN C/O IAW AMM 79-00-00-210-810-A. NO LEAKS APPARENT.GR TO BW C/O FOR TS. R & R NR 1 ENG REF WO 1479572. OK FOR CONT SVC.