As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DOOR 1R ARMING HANDLE WILL NOT SLIDE ALL THE WAY DOWN, DOOR WILL NOT ARM. MAINTENANCE FOUND THE R1 DOOR ARMING LEVER HANDLE INSTALLED ON THE WRONG SIDE OF THE ARMING LEVER. MAINTENANCE INSTALLED THE HANDLE ON THE CORRECT SIDE OF THE LEVER AND A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED. R1 DOOR ARMS CORRECTLY AND DOOR ARMING INDICATION CHECKS OK.