As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3161, RT MAIN DC GEN FAILED INFLIGHT. CREW ATTEMPTED RESET PER QRH AND 2ND TIME PR MXC BUT GEN WOULD NOT COME BACK ONLINE. AIR RETURN TO DTW. MAINTENANCE UPON INSPECTION FOUND BROKEN WIRE AT RT START/GEN, REPAIRED WIRE AND ALL CHECKS GOOD.