What was found
DURING C-03 CHECK THE L-2 DOOR ASSIST DAMPER CYLINDER FAILED FUNCTIONAL CHECK. MAINTENANCE REMOVED AND REPLACED THE L-2 DOOR DAMPER CYLINDER IAW AMM SUBTASKS 52-13-14-020-050-0 & 52-13-14-420-051-0. ADJUSTED AND SERVICED IAW SUBTASK 52-13-14-820-050-0 & 52-13-14-200-001; OPERATIONAL CHECK GOOD IAW SUBTASK 52-13-14-210-060-0. VENDOR FUNCTIONAL CHECK OF DAMPER CYLINDER S/N 101 CONFIRMED FAILURE OF UNIT. REAR CUP WAS FOUND RUSTED & PITTED, FRONT CUP WAS FOUND LOW ON FLUID, AND DETERIORATED SEALS WERE FOUND ON THE PERCUSSION AND BOTTLE ASSEMBLY, REPLACED ALL DAMAGED PARTS AND COMPLIED WITH SERVICE BULLETINS FE174-52-1, 2, & 3R1 CHANGING PART NUMBER TO FE174-0011.