Technician found a leak in system. Will need to recovery charge. Braze leak. Replace filter drier. Pressure test and pull vacuum. Recharge with refrigerant. Test operation. Recover charge from system. Removed filter drier. Replaced filter drier. Unfastened expansion valve and removed teflon o’ ring and brazed distributor head. Replaced teflon o’ring. Fastened expansion valve flare fitting. Pressurized system with nitrogen. Unit held pressure. Pulled vacuum and performed decay test. Unit passed decay test. Charged system with 410A. Verified operations.