As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING OUT OF 28,000FT THE CREW RECEIVED A MASTER CAUTION LIGHT. THIS WAS INDICATIVE OF THE LOW PRESSURE AND QUANTITY ON THE NUMBER 1 (LEFT) HYDRAULIC SYSTEM. THE CREW ELECTED TO DIVERT TO TUS. MAINTENANCE ISOLATED IT TO A RUPTURED NR 1 SYSTEM (LEFT) HYDRAULIC PRESSURE HOSE IN LEFT PYLON.