As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3008, CMH TO LGA - DURING INITIAL CLIMB-OUT AFTER GEAR RETRACTION, THE CREW RECEIVED A LG AIR/GND FAIL MESSAGE ON EICAS, AND WITHIN 1 MINUTE A ENG 1-2 REV DISAGREE. THE QRH CHECKLISTS WERE FOLLOWED AND THE AIRCRAFT LANDED WITHOUT INCIDENT BACK AT CMH. THE GEAR FAULT WAS TROUBLESHOT AND THE CMC HAD MESSAGES FOR THE NOSE LANDING GEAR WOW PROX SWITCH FAIL AND T/R LOGIC. THE NOSE LANDING GEAR WOW PROX SWITCH WAS REPLACED AND THE NOSE LANDING GEAR WAS FULLY SERVICED. GEAR SWING TESTS WERE GOOD WITH NO FURTHER FAULTS FOUND.