As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PULLING INTO GATE IN SLC THERE WAS A HOT BURNING ODOR FOLLOWED BY SMOKE COMING OUT OF GASPERS, FOLLOWED BY APU AUTO SHUTDOWN. REMOVED AND REPLACED APU WITH A SERVICEABLE UNIT PER CRJ MM 49-10-00. OPS AND LEAK CHECK GOOD. P/N: 3800488-3, S/N OFF: P-745, S/N ON: P184C.