As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE SMELL AND HAZE. BURNING SMELL WAS STRONGEST IN THE AFT AVIONICS BAY, THE CABIN LIGHT CIRCUIT BREAKER WAS TRIPPED. FLT 5538. REMOVED AND REPLACED CABIN LIGHTING TRANSFORMER RECTIFIER UNIT IAW AMM. ALL CABIN LIGHTING FUNCTIONS RESTORED.