As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT AT FL310 CREW GOT GEN2 CAUTION MESSAGE. CA TOOK OVER THE CONTROLS AND FO RAN THROUGH ( QRC/QRH) BUT THE MESSAGE WAS STILL THERE. APU WAS ALREADY DIFFERED SO CREW DECLARED MECHANICAL EMERGENCY. CREW DID A NORMAL LANDING IN CLT ( NO OVERWEIGHT AND NO BRACE IN CABIN). PLANE TAXIED TO GATE UNDER ITS OWN POWER TRUCKS ROLLED. NO OXYGEN, NO EMK KIT AND NO INJURIES. REMOVED AND REPLACED GCU2. OPS CHECK GOOD