As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT GATE, NR 2 TRU FAILED UPON SHUTDOWN. FOLLOWED BY RECIRC, SMOKE AND SMELL OF SMOKE IN FWD CABIN. OCCURRED FOLLOWING ENGINE SHUTDOWN AFTER GPU CONNECTED. PERFORMED FIM TASK 21-20-00-810-801-A AND FOUND HS-ACE IMPLODED. NO DAMAGE FOUND IN SURROUNDING AREA. REMOVED AND REPLACED HS-ACE REF MM 27-43-01, OPS CHECK GOOD AFTER HS-ACE REPLACED REF FIM 24-31-00.