As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW VERBAL: REPORTS ON T/O WHEN GEAR HANDLE MOVED TO UP, HAD GEAR DISAGREE. UP AND DOWN ILLUMINATED. FOLLOWED QRH, NO CHANGE WHEN ALT GEAR DOOR CHECKED. ALT GEAR DOOR FOUND NOT FLUSH. CONTINUED WITH AIR RETURN IAH. RESEAT ALT GEAR DOOR PANEL OPS SWING ALL 3 GEARS CHK NORMAL REF AMM 32-32-00-710-801.