As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI, THE CREW DETECTED A BURNING PLASTIC SMELL. THE CREW NOTICED THE ANNUNCIATOR PANEL GO ON AND OFF AS WELL AS LOSING SOME INDICATORS. THE AIRCRAFT RETURNED TO BASE FOR MAINTENANCE. THE MAINTENANCE CREW DETERMINED THAT THE GPS/NAV SWITCH HAD SHORTED AND OVERHEATED.