As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAXI FROM HANGAR TO THE GATE, THE APU TEMP GAUGE BACKROUND LIGHT WAS FLICKERING AND THERE WAS THE SMELL OF SMOKE IN THE COCKPIT. FOUND SEVERAL WIRES CHAFED AND BURNED BEHIND P5 PANEL. REMOVED DAMAGED WIRES AND SPLICED REPLACEMENT WIRES. RE-TERMINATED WIPER SWITCH AND S58, S57, S92 AND S62 WIRES. REPLACED GEN/APU CONTROL MODULE DUE TO BURN SPOT ON BOTTOM RIGHT CORNER OF MODULE.