As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT ELECTRICAL WIRE BURNING SMELL IN COCKPIT AND CABIN, NO SMOKE. FA REPORTS GRINDING NOISE FROM FLOOR MID CABIN. COCKPIT TEMP INCREASES. FOLLOWED QRH, SHUT OFF HP & BLO. DIVERTED TO RST. REMOVED AND REPLACED NR 1 INVERTER PN PC251-123C, SN OFF 8429, SN ON 8828. NR 1 INVERTER OPS CHECKS GOOD