What was found
DFW - FLT 3621 - ON APPROACH IN DFW, CREW REPORTED A POPPING SOUND FOLLOWED BY SMELL OF SMOKE AND SEVERAL TRIPPED CIRCUIT BREAKERS. AIRCRAFT LANDED NORMALLY WITHOUT INCIDENT. MAINTENANCE DISCOVERED SEVERAL CHAFED WIRES UNDER THE FLOOR BEHIND THE PILOT SEAT. MAINTENANCE WILL REPLACE A TOTAL OF 28 WIRES. INCIDENT STILL UNDER INVESTIGATION AS TO DIRECT CAUSE OF DISCREPANCY AND IF FAILURE OF COMPONENT IS IN QUESTION. AIRCRAFT REMAINS OUT OF SERVICE. (X)