What was found
NON-ETOPS FLT 281 KOA-HNL: AFTER ENGINE START, (OVHT/DET) ANNUNCIATOR LIGHT AND MASTER CAUTION LIGHT ILLUMINATED. CREW WAS UNABLE TO RESET LIGHT AND RETURNED TO BLOCK. MX ACTION: MAINTENANCE PERFORMED OVERHEAT AND FIRE WARNING TEST ALONG WITH THE CARGO FIRE DETECTION SYSTEM TEST. NO FAULTS WERE NOTED. RESET POWER TO AIRCRAFT AND MASTER CAUTION RESET NORMALLY WITH THE (OVHT/DET) ANNUNCIATOR LIGHT EXTINGUISHED. AIRCRAFT WAS RETURNED TO SERVICE. DURING OVERNIGHT, MAINTENANCE REMOVED AND REPLACED THE NR 1 AFT CARGO SMOKE DETECTOR AS PRECAUTIONARY. AIRCRAFT WAS RETURNED TO SERVICE. SPECIFIC PART OR STRUCTURE CAUSING DIFFICULTY.