As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF NR 1 NAV RECEIVER OCCURRED AFTER TAKEOFF. VOR/LOC FLAG WAS IN VIEW AND NO BEARING WAS AVAILABLE. PULLED AND RESET NAV CIRCUIT BREAKER WITH NO HELP. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. FOUND NR 1 NAV/COMM CONTROL PANEL NOT SEATED PROPERLY. REPOSITIONED PANEL. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.