What was found
AIRCRAFT RETURNED TO PLATFORM AFTER ENGINE START, THE LT GENERATOR WAS OUT OF SERVICE, THE CORRESPONDING SWITCH WAS RESEATED AND FREQUENCY AND VOLTAGE WERE WITHOUT INDICATION. LT GCU, CSD AND CHIP DETECTOR WERE CHECKED AND NO FAILURE WAS DETECTED, THEREFORE, GENERATOR WAS DEFERRED IAW MEL 24-1, CATEGORY (B). AIRCRAFT WAS REFUEL AND DISPATCHED. DURING TRANSIT CHECK, LT GENERATOR WAS REPLACED IAW MM 24-20-01, TESTED CORRECT. DEFERRED REPORT WAS CLOSED.