As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3870 (TYS TO ATL) AFTER TAKEOFF GEAR UP DISAGREE, LEFT INITIALLY THEN INCLUDED THE NOSE & PROXIMITY SYSTEM 1 STATUS. COMPLETED QRH WITH GEAR DOWN AND LOCKED. FLIGHT CONTINUED TO ATL AND LANDED SAFELY. (AIRCRAFT WAS OUT OF SERVICE AND IN WORK FROM 1/24 UNTIL 1/28). REMOVED AND REPLACED PROXIMITY 20. OPS CHECKED GOOD PER AMM 32-61-05. OK FOR SERVICE.