What was found
AIRCRAFT RETURNED TO PLATFORM, RT GENERATOR OUT OF LINE AFTER ENGINES START. DURING MAINTENANCE CHECK, THE RT GCU WAS RESEATED, BUT THE FAILURE CONTINUED. THE REPORT WAS DEFERRED IAW MEL 24-1-1 CAT B. DURING OVERNIGHT CHECK, THE RT CSD, GENERATOR AND HEAT EXCHANGER WERE REPLACED IAW MM 24-10-01, 24-20-01 AND 24-10-03, RESPECTIVELY, TESTED CORRECT.