What was found
#1 OIL DOOR FOUND OPEN DURING PREFLIGHT WITH OIL CAP MISSING. REMOVED FROM SERVICE. INSPECTED #1 ENGINE COWL, OIL SERVICE DOOR, FLAPS AND LH GEAR. NO DAMAGE NOTED. INSTALLED NEW FROM STOCK OIL CAP IAW GE AMM 79-11-05-400-801 A #1 ENGINE DID NOT REQUIRE SERVICING. A/C OK FOR SERVICE. AIRCRAFT RETURNED TO SERVICE.