What was found
RT ENG OIL TEMP IN AMBER RANGE, 168 DEGREES ON CLIMBOUT FROM ATL. RT OIL PUMP LOW EICAS MSG. FOUND OIL TANK CAP POPPED OFF, FOUND LOCKING TAB VERY LOOSE, POPS OFF WITH MINIMAL PRESSURE. RETORQUED ADJUSTMENT SECURING NUT ON CAP LOCKING TAB ASSY AND REPLACED O-RING. CAP REINSTALLED, SECURE AND TIGHT.