What was found
BWI/SHD - FLT 5116 - FLIGHT JUST DEPARTED, LT ENG OIL PRESS LIGHT ILLUMINATED. PRESS GAUGE DROPPED TO ZERO & ENG STARTED TO SHUT ITSELF DOWN. FLT CREW MANUALLY SHUT ENG DOWN. THEY DECLARED AN EMERGENCY & RETURNED TO BWI WHERE THEY MADE A SAFE LANDING. MX DISPATCHED FROM CLT. IN BWI, EXAMINED ENG & FND EVIDENCE OF OIL LEAK IN NOSE CASE AREA. SEVERAL BOLTS ON NOSE CASE FND LOOSE WERE RETORQUED. ENG SERVICED WITH OIL & A DRY MOTORING RUN PERFORMED. NO LEAKS FND. ENG OIL AGAIN RE-SERVICED & ENG START ATTEMPTED, ENG DID NOT START. GRBX DRAIN PLUG REMOVED & APPROX 5 GAL OF OIL DRAINED FROM GRBX. T/S REVEALED DRIVE GR FOR SCAV PUMP ONLY TURNING 1/3 THE TIME. ENG REMOVED & REPLACED & A/C RETURNED TO SERV.