As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT BURNING SMELL CBP2 Q2 POPPED. DCU AURAL INOP STATUS MESSAGE. THERE WAS NO MEDICAL ATTENTION REPORTED / INSPECTED FOR SMOKE ODOR ON FLIGHT DECK IAW FIM 21-21-00-810-806-A01. SUSPECT DCU 2 AND DCU CONTROL PANEL AS CAUSE OF ODOR. REMOVED AND REPLACED DCU2 IAW CRJ 700 AMM 31-41-04-000/400-801-A01.