As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ARRIVAL AT GATE L1 DOOR WOULD NOT OPEN. ACFT GROUNDED. R & R THE L1 DOOR GUIDE ARM IAW AMM 52-11-21-400-802. ACCOMPLISHED GUIDE ARM ADJUSTMENT, REF AMM 52-11-00-820-801. OPS CHECK GOOD. NEW GUIDE ARM INSTALLED IS POST SB 737-52-1175.