As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR FAILED TO RETRACT CAUSING DC BUS LOW VOLTAGE WARNING LIGHT TO FLASH ON AND OFF THREE TIMES UNTIL GEAR LOCKED UP. UPON SUBSEQUENT A.D.I.Z. REENTRY, TRANSPONDER SET TO 0440 AS PROVIDED BY ATC. TRANSPONDER DISPLAYED 0440 BUT TRANSMITTED 1200. AIRCRAFT PROPERLY ENTERED ADIZ IAW NOTAM PROCEDURES. ATC FILED PILOT DEVIATION REPORT TO FAA FOR FAILURE TO SQUAWK 0440. NOTE: REVERSE CURSOR NOT SEEN BY EITHER PILOT.