What was found
EN ROUTE FROM EWR TO PHX RECEIVED ECAM MESSAGE FOR GREEN HYD RESERVOIR LOW. DECLARED EMERGENCY & LANDED WITHOUT FURTHER DIFFICULTY. MAINTENANCE TROUBLESHOT & FOUND FLUID LEAKING FROM THE TOP OF NR 1 YAW DAMPER (3CC1), ISOLATED THE NR 1 YAW DAMPER AND ISSUED MEL 22-63-01, COND 1, YAW DAMPER NR 1 INOP. MX R & R NR 1 YAW DAMPER SERVO (3CC1) IAW T/C R6B27302, LEAK AND OPS CHECK WAS GOOD. VENDORS INCOMING TEST OF YAW DAMPER S/N 2636 CONFIRMED REASON FOR REMOVAL FOR FAILING INSULATION TEST. UNIT WAS DISASSEMBLED AND MODIFICATION KIT WAS INSTALLED, REPLACED BASE PLATE AND PACKINGS. REPAIR AND TEST ACCOMPLISHED IAW CMM 27-26-51, ISS 11.