As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - ON LANDING FOR FLIGHT 4438, INTERMITTENT ELECTRICAL SMELL IN COCKPIT. FOUND COKE SPILLED DOWN ON PASSENGER ADDRESS AMPLIFER UNDER THE FLOOR. FOUND POSSIBLE ELECTRICAL SMELL COMING FROM UNIT. REPLACED PASSENGER ADDRESS UNIT IAW CRJ700 AMM 23-31-01-000/400-901-A01,OPS TEST GOOD. AIRCRAFT RETURNED TO SERVICE.