As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 1 AC INVERTER FAILED DURING DESCENT. TROUBLE SHOT AC SYS & FOUND THE NR 1 INVERTER DROPPING OFF LINE DUE TO BUSS TIE CONTACTOR OPENING. REMOVED THE DEFECTIVE BUSS TIE CONTACTOR PN LDA150-A8C SN 1220, INSTALLED AN OVERHAULED UNIT.