As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELL COMING FROM BACK OF AIRCRAFT. FOUND IT WAS PACK 2 OVERHEAT 120 C. DEFER RT A/C PACK PER MEL 21-51-01 CAT C. R&R FAN BYPASS CHECK VALVE IAW AMM 21-52-07 DID NOT FIX. R&R ACM IAW AMM 21-51-10. OPS CHECK GOOD IAW AMM 21-51-00 MMO2 UPDATED PLACARD REMOVED.