What was found
GEN 1 OFF BUS YELLOW CAS IN FLIGHT WITH ASSOCIATED VIBRATION. RAN CHECKLIST AND EVENTUALLY SHUT DOWN LEFT ENGINE PER QRH. PERFORMED UNEVENTFUL ONE ENGINE INOPERATIVE LANDING AND SHUT DOWN OPERATING ENGINE. CORRECTIVE ACTION: REMOVED STARTER PN: 400SG180Q-6 SN S04367. INSTALLED OVERHAULED STARTER GENERATOR. REPOSITIONED AC ONTO RAMP. PERFORMED STARTER GENERATOR OPERATIONAL CHECKS, ALL CHECKS ARE SATISFACTORY AT THIS TIME AND NO FAULTS WERE NOTED DURING OPERATION. RETURNED AC TO ORIGINAL CONFIGURATION. WORK PERFORMED IAW AMM 24-31-01.