As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN WILL NOT COOL WITH APU AIR. REPLACED RT PACK REHEATER PER MM DUE TO HAD 4 INCH CRACK. REPLACED LT PACK REHEATER AND LOW LIMIT VALVE DUE TO NOT FULLY CLOSING PER MM. RAN PACKS AND L PACK DISCHARGE TEMP WAS 11 DEG AND R PACK WAS 5 DEG. ALL PACK PARAMETERS CHECK NORMAL.