As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LH INERTIAL REFERENCE SYSTEM FAULT LIGHT ILLUMINATED DURING TAKEOFF ROLL; REVIEWED QRH BUT UNABLE TO ESTABLISH NAVIGATION, RETURNED TO FIELD. ACCOMPLISHED ADIRS BITE AND GROUND TEST IAW FIM 34-21-00-810-801, FOUND PILOT'S VOR/ILS INFORMATION MISCONFIGURED. RECONFIGURED VOR/ILS INFORMATION, OPS CHECK GOOD.