As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL COMPARTMENT TEMP HIGH AT 3200 MSL. COMPLIED WITH QRH 21.4. LIGHT WENT OUT 1:10 AFTER STEP 3 BUT BEFORE CONTINUING TO STEP 4. APU WAS RUNNING WITH AIR OFF. REF WO 00260195 -1 & -2 TC 21-059-010 & TC 21-059-005. FOUND LT HEAT EXCHANGER CLAMP OFF. SECURED IAW MM 21-20-06, LEAK CHECKED GOOD.