As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
190219/1 - (AT GATE) DETECTED STRONG ACRID ELECTRICAL BURNING ODOR FOLLOWED BY APU AUTO SHUTDOWN, GRND SUPERVISOR EXCESS SMOKE FROM APU EXHAUST AFTER APU SHUTDOWN. FA REPORTED POP PRIOR TO APU. 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)