What was found
CREW DECLARED AN EMERGENCY DUE TO HYD GREEN LOW AIR PRESSURE WARNING DESCENDING THROUGH FL222. COMPLIED W/ECAM. GREEN SYS DID NOT RECOVER. RESULTED IN EMERGENCY GEAR EXTENSION AND ACFT TOW FROM RUNWAY. GREEN SYS HYD PRESSURE NORMAL. GREEN SYS AIR PRESSURE LOW INDICATION, ECAM WARNING & CAUTION - RESERVOIR LOW AIR PR. DURING TROUBLESHOOTING, FOUND GREEN HYD SYS AIR PRESSURE WITHIN NORMAL LIMITS & MAINTAINING PRESSURE ECAM FOUND TO BE A FALSE INDICATION. PFR SHOWS HYD G 1151GN FAULT. R & R PRESS SW 1151GN. OPS AND LEAK CHECK OK.