As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE WARNING MESSAGE AT BELOW 1000FT AFTER TAKEOFF. PERFORMED QRH. RETURN TO DEPARTURE. INTERROGATED PSEU AND FOUND CODE FOR LT MLG S20 LG UPLOCK FAR. ACCOMPLISHED FUNCTIONAL CHECK OF EXT AND RETRACTION SYSTEM. DUPLICATED MESSAGE ON RETRACTION. FOUND S20.O26 OUT OF RIG. ADJUSTED S20 IAW AMM 32-32-05-400-801. FUNCTIONAL TESTED NUMEROUS TIMES IAW 32-30-00-720-801 WITH NO FAULTS OR GEAR DISAGREE. PSEU MEMORY RESET.