As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT SMELLED ELECTRICAL WIRES BURNING AND SMOKE WAS EVIDENT IN COCKPIT. PILOT MADE PRECAUTIONARY LANDING. UPON INSPECTION, DETERMINED THE RADAR ALTIMETER INTERNAL POWER SUPPLY HAD SHORTED OUT CAUSING SMOKE TO BE PICKED UP BY THE VENT BLOWERS IN THE COCKPIT. THIS UNIT WAS REPAIRED BY TRIMBLE 10 HOURS PREVIOUSLY. UNIT SENT BACK TO TRIMBLE.