What was found
DURING CRUISE FLIGHT AT 17,000, THE CREW SMELLED BURNING WIRE, NO SMOKE VISIBLE. CREW RAN QRH AND FOUND CIRCUIT BREAKERS L2, RH TAIL PIPE HOT DETECTION AND L8, EMERGENCY LIGHT CONTROL WERE OPEN. AIRCRAFT RETURNED TO DTW. MAINTENANCE REMOVED ACCESS PANEL BENEATH BREAKERS AND FOUND NO EVIDENCE OF BURNT WIRES, RESET BREAKERS. ALL CHECKS GOOD.