As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - INFLIGHT ORD-MBJ CREW REPORTED LEFT HYDRAULIC SYSTEM QUANTITY DECREASING SLOWLY IN FLIGHT. FLIGHT DIVERTED LANDED MIA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED HYDRAULIC LINE THAT WAS LEAKING. SYSTEM GROUND CHECKED NORMAL OPERATION.