As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK EXHAUST PLENUM DIFFUSER DAMAGED. MOUNT BRAKETS ARE BROKE. SEE PHOTO. ADDED PART #. REMOVED AND REPLACED LEFT PACK PRIMARY HEAT EXCHANGER DIFFUSER AND PLENUM REF AMM 21-51-03-400-804-002 THRU STEP I(17). COMPLIED WITH INSTALLATION TEST REF AMM21-51-03-400-804-002. CKS GOOD. NO LEAKS DETECTED.