As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL BURNING ODOR IN COCKPIT GOES AWAY WHEN NAV 1 IS TURNED OFF. MAINTENANCE INSPECTED COCKPIT AND AVIONICS RACK FOUND ONLY SLIGHT ODOR IN AVIONICS RACK, SUSPECT ODOR IS FROM NR 1 NAV RECEIVER CHANGED ON 6/16/04 AND ODOR IS RESIDUAL.