As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR WOULD NOT RETRACT. INDICATED DOWN & GREEN WITH HANDLE UP. ON ARRIVAL AT GATE NOSE STRUT WAS FLAT. REPLACED THE TEE SEAL WITH THE SPARE SEAL IAW AMM. EXTENDED STRUT FULLY SEVERAL TIMES AFTER SEAL REPLACEMENT. COMPLIED WITH FUNCTIONAL TEST OF THE LANDING GEAR EXTENSION RETRACTION SYSTEM IAW AMM. OPERATIONS CHECKED GOOD AT THIS TIME.