What was found
ENGINE NR 1 LOST ALL OIL DURING LOSS OF PRESSURE PRECAUTIONARY ENGINE PROCEDURES WERE COMPLETED (AFTER 2 MIN COOL DOWN) AT 10 PSI OIL PRESSURE DROPPED TO 0 DURING WIND MILLING 17:05-18:00 OIL PRESSURE WAS AT 10 PSI AT SHUTDOWN AND DECREASE. INSPECTED ENGINE VISUALLY IAW TROUBLESHOOTING 02A OF PWA MM 72-00. FOUND SEVERAL GEARBOX CASE BOLTS LOOSE, TIGHTENED BOLTS PER PG 108B STEP 4 ACCOMPLISHED MAIN OIL SCREEN INSPECTION AND REPLACEMENT (NO ABNORMALITIES NOTED) ENG CHP DETECTOR INSPECTIONS.