As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT NR 4246 - LOW LEVEL HYDRAULIC GREEN SIDE IN FLIGHT. AIRCRAFT RETURNED TO ORD AND LANDED WITHOUT INCIDENT. FOUND FITTING GOING TO THE INLET PORT OF DUAL POWER BRAKE VALVE CRACKED. REMOVED AND REPLACED NR 6 FITTING AT VALVE. OPS AND LEAK CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. (M)