What was found
PASSING 8500FT ON DEPARTURE WHEEL WELL FIRE WARNING LIGHT ILLUMINATED W/ FIRE WARNING BELL SOUNDING LOWERED GEAR AND RETURNED TO SEA. FIRE WARNING EXTINGUISHED AFTER (IMMEDIATELY) GEAR LOWERING. FIRE/OVHT DET UNIT LOGGED CODE 84 WW FIRE ALARM. VERIFIED NO PNEUMATIC LEAKS IN THE WHEEL WELL/KEEL BEAM AREA. ACCOMPLISHED FIM'S 26 18 T801& 802. MAIN W/W DETECTOR M270 CONT. CKS NML AS DOES MIN. RESISTANCE CORE TO GND CK. CHECKED AT DETECTOR & BACK OF M237. ALSO INSPECTED WIRING GOING TO DETECTOR M270 IN W/W. NO DEFECTS NOTED. REMOVED AND REPLACED M237 REF AMM 26 18 01. OPS NML REF MM 26 18 00. REPLACED M 270 DETECTOR OPS NML REF AMM 26 18 02/401.