As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAKEOFF, THE NR 1 INVERTER FAILED. NR 2 INVERTER WAS SELECTED BY CREW BUT IT WAS ALSO FAILED. WITH THIS DOUBLE FAILURE CREW LOST MOST OF ENGINES INSTRUMENTS. ACFT LAND BACK IN YVP WITHOUT ANY ISSUES. MAINTENANCE FOUND ANNUNNCIATOR RELAY TO BE FAULTY. RELAY REPLACED AND SYS TESTED SERVICEABLE.