As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DETECTED STRONG ACRID ELECTRICAL BURNING SMELL FOLLOWED APU AUTO SHUTDOWN, GROUND SUPERVISOR EXCESS SMOKE FROM APU EXHAUST AFTER APU SHUTDOWN. F/A REPORTED POP PRIOR TO APU SHUTDOWN. FOUND APU SEIZED APU DOOR IS CLOSED, NO SMELL OF ANY KIND EVIDENT WITH APU. REMOVED AND REPLACED APU IAW AMM 49-10-00. OPS CHECK GOOD AT THIS TIME. (K)