As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TIME AFTER FOLLOWING THE QRH PROCEDURES THE RT PACK BEGAN TO CYCLE ON & OFF CONTINUOUSLY, 5 MIN OFF, 1 MIN ON. PERFORMED ASCTU BITE & CTC BITE, FOUND MSG 21-51245 RT PACK OUTLET TEMP SENSOR AT FAULT IAW FIM TASK 21-51-00-810-859. R & R RT PACK OUTLET TEMP SENSOR 2 IAW AMM21-51-46. OPERATED PACKS & NO FAULTS NOTED.