What was found
TAIL COMPARTMENT TEMP HIGH ON TAKEOFF RIGHT AFTER V1. COMPLIED WITH QRH 21.4 DURING STEP 5, LIGHT WENT OUT AFTER 90 SECONDS. APU HAD BEEN RUNNING WITH APU AIR OFF. COMPLIED WITH TC 21-059-010 & 21-059-005, FOUND LEAKING CLAMP FROM DUCT TO INLET OF PRIMARY HEAT EXCHANGER. R & R CLAMP IAW AMM 20-10-11. LEAK CHECKED GOOD. SENSORS OPERATIONS CHECKED GOOD. ACFT OKAY FOR SERVICE.