As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKE OFF LANDING GEAR WOULD NOT RETRACT. FOLLOWED QRH PROCEDURE. AFTER EMERGENCY GEAR DOOR CYCLED AND VERIFIED CLOSED, GEAR CYCLED NORMALLY AND OPERATED NORMALLY FOR LANDING. ACCOMPLISHED OPERATIONAL CHECK OF LANDING GEAR IAW B737-NG AMM 32-32-00. OPERATIONAL CHECKED GOOD. NO FAULTS FOUND AT THIS TIME.