As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: HYD G RSVR LO LVL AMBER MESSAGE IN FLIGHT. EMERGENCY WAS DCLARED AND AIRCRAFT LANDED WITHOUT INCIDENT. MAITENANCE FOUND ENG #1 T/R HYDRAULIC ISOLATION VALVE SUPPLY LINE CRACKED AND REPLACED ENG #1 T/R HYDRAULIC ISOLATION VALVE SUPPLY LINE IAW AMM 29-11-49 AND AMM 78-37-51-400-010-A.