As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2592, MIA-JFK. (AIRCRAFT DECLARED AN EMERGENCY INTO JFK) ' Y RSVR LO LVL IN FLIGHT; FOUND HYDRAULIC LEAKS COMING FROM PTU. QUICK DISCONNECT R/R DAMAGED O-RING REF AMM 29-23-00 PERFORMED LEAK CHECK, LEAK CHECK GOOD. REPLENISHED HYD SYSTEM REF AMM 12-12-29. YELLOW HYD SYS RESTORED BACK TO NORMAL.'