As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: IN FLIGHT, HYDRAULIC SYSTEM A PRESSURE DROPPED FROM 87% TO 58% SLOWLY OVER 1 HOUR AND 50 MINUTES. FLIGHT DECLARED AN EMERGENCY AND DIVERTED TO CUN, LANDING SAFELY. REPLACED HYDRAULIC SYSTEM A FLUID QUANTITY TRANSMITTER PER AMM 29-33-12. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.