As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, THE FLIGHT CREW REPORTED THAT BOTH THE NAV1 AND NAV2 RADIOS WERE DASHED OUT AND HAD BECOME UN-TUNABLE. THE ONLY NAVIGATIONAL CAPABILITY THAT THE AIRCRAFT HAD OPERABLE WAS THE GPS NAVIGATIONAL UNIT AND WEATHER CONDITIONS WERE TOO LOW TO CONDUCT A GPS APPROACH. THE FLIGHT CREW DIVERTED TO GRR AND LANDED WITHOUT INCIDENT. WHEN MAINTENANCE ARRIVED, RE-RACKED THE NAVIGATIONAL UNITS. OPERATIONAL CHECKS WERE CONDUCTED ON BOTH UNITS AND FOUND TO BE GOOD.