As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL IN COCKPIT INFLIGHT REPORTED BY FLIGHT CREW. ISOLATED SMELL AND EVIDENCE OF SMOKE TO K0543 FEEDER PROTECTION RELAY IN LEFT DC RELAY BOX. REMOVED AND REPLACED K0543 IAW MM 54-52-00 AND MM 24-52-00. RAN ENGINES, SYSTEMS OPS CHECKS GOOD. NO FURTHER ODORS NOTED.