As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT BASE, WHEN CAPTAIN TURNED ON THE BATTERY MASTER SWITCH, SUDDENLY GOT A BURNING ODOR WITH C/B POPPING. POPPED THE CAUTION LIGHT NR 2 AND AUTO-PILOT DISENGAGE C/B. FOUND NR1 RNAV (RADIO NAVIGATION) ANNUNCIATOR PANEL P/N : 83461029-003 AT FAULT ONE COMPENSATOR OVERHEATED ON PC BOARD (P/N : 82210023-003) ON THIS ASSY. PANEL REPLACED AND ACFT RETURNED TO SERVICE.