What was found
ON CLIMBOUT THUR 1200 FT, TAIL COMPARTMENT TEMP HI LIGHT CAME ON EVEN WITH BOTH A/C SUPPLY SWITCHES IN HP BLEED OFF. LIGHT ILLUMINATES WHEN CLIMB THRUST APPLIED. FOUND A/C WATER SEPARATOR TO CHECK VALVE DUCT CRACKED. REMOVED DUCT WELDED CRACK PER ERA 377908-14, INSTALLED DUCT, LEAK CKS OK. REPLACED RIGHT AND LEFT COMPARTMENT HI TEMP SENSORS, RAN ENGINES, SYS OPS CHECKS OK.