What was found
(CAN) LT ENGINE OIL PRESSURE CAUTION LIGHT ILLUMINATED, OIL PRESSURE INDICATOR ALSO REDUCING. QRH ACTIONED AND ENGINE SHUTDOWN. DECLARED EMERGENCY AND EMERGENCY SERVICES ON STANDBY. UNEVENTFUL APPROACH AND LANDING, TAXIED TO GATE WHERE PAX DISEMBARKED. NR 1 AC GENERATOR FOUND TO BE LEAKING FROM CASE. SCREWHEAD AND SEAL WASHER FOUND BROKEN OFF ON TOP OF ENGINE. AC GENERATOR REPLACED.