As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB - AIR/GND DISAGREE STATUS MESSAGE APPEARED. COMMUNICATED THIS TO FLT CONTROL AND AMC. WE WERE DIRECTED BY ARTR TO RETURN TO SDF REF ALERT T 181888.ACCOMPLISHED MLG TILT SENSOR ADJ/TEST IAW AMM 32-09-07 AND AMM 32-09-03. FOUND PSEU TO FAIL R/H TILT SENSOR ST68 NEAR ON GROUND, REPLACED SENSOR 5268R GEAR TILT SENSOR PER AMM 32-09-13, SENSOR NOW SHOWS FAN ON GROUND. OPS CHKS AND TEST GOOD.