As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TRANSIT CHECK, DETECTED SMOKE AND STRONG NOISE WAS HEARD IN THE APU. MX PERSONNEL PERFORMED REVISION DETECTING INTERNAL DAMAGES IN THE APU; SO THE REPORT WAS DEFERRED IAW MEL 49-1 CAT C. MX PERSONNEL REPLACED THE APU IAW AMM 49-11-00, TESTED CORRECT.