What was found
CLIMBING THRU 3000FT AGL NR 1 ENGINE OVERHEAT LIGHT ILLUMINATED. ENGINE NR 1 INDICATIONS WERE NORMAL. FOLLOWED QRH PROCEDURES LIGHT STAYED ON WITH THE THROTTLE AT IDLE. SHUT NR 1 ENG DOWN & LIGHT STAYED ON. PULLED FIRE HANDLE & LIGHT WENT OUT. RETURNED WITH NO FURTHER PROBLEMS. FOUND THE UPPER FAN A FIRE LOOP TO BE OUT OF TOLERANCE PER FIM 26-18-00-810-805. REMOVED & REPLACED UPPER FAN NR 1 FAN FIRE DETECTOR PER AMM 26-11-01. REPLACED NR 1 ENGINE LOWER FAN LEFT ENGINE CORE AND RIGHT ENG CORE FIRE DETECTOR ASSYS PER AMM 23-11-01-00-802 & 26-11-01-400-803. REPLACED FAN FIRE DETECTOR DP1601 DP1501 DP30252 HARNESS MW0315 MW0316 PER AMM 26-11-02. REPLACEMENT OF FAN HARNESS PER AMM 26-11-05-802 AND 26-11-11. REPLACED CORE FIRE DETECTOR HARNESS PER AMM 26-11-05-802 AND 26-11-02-400-802. REPLACED FIRE & OVERHEAT DETECTION UNIT M279 REF AMM 26-10-01-000-801 & 26-10-01-400-801. GROUND RAN NR 1 ENGINE CHECKED NORMAL. OPS CHECKED GOOD.