As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG BURNING SMELL AT FL190 AND LIGHT SMOKE OBSERVED BY CREW & PAX. RETURNED TO ANC. VISUALLY INSPECTED WIRING & CONNECTIONS AT WINDSHIELD PANELS, CB PANELS, OVERHEAD SWITCH PANELS. NO DEFECTS NOTED. UNABLE TO DUPLICATE DISCREPANCY AT EXTENSIVE GROUND RUN SIMULATING FLIGHT CONDITIONS. A/C DISPATCHED FOR OPERATIONAL TEST FLT ONLY.