What was found
ENG NR 1 OVERHEAT LIGHT AND MASTER CAUTION ILLUMINATED ON CLIMBOUT AT ABOUT 15,000 FT. PERFORMED QRH PROCEDURES. ACFT GROUNDED. DIVERSION TIME -15 MINUTES. AFTER ENGINE START, NR 1 ENGINE OVERHEAT AND MASTER CAUTION LIGHT ILLUMINATED. PERFORMED QRH PROCEDURES, SHUTDOWN ENGINE & RETURNED TO GATE. FOUND LOWER FAN DETECTOR END BROKEN. REPLACED UPPER FAN DETECTOR, LOWER FAN DETECTOR, RT CORE DETECTOR AND LT CORE DETECTOR AND ENG/APU FIRE/ OVHT DETECTOR CONTROL AS PRECAUTIONARY REF AMM 26-11-01. RAN ENGINE OPS CHECKED NORMAL.