As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ENROUTE FROM JFK TO BDL, THE FLIGHT CREW NOTICED THAT THE MAIN HYDRAULIC QUANTITY SYSTEM WAS DECLINING. THE FLIGHT CREW FOLLOWED COMPANY PROCEDURES AND CONTINUED TO BDL FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT AND TRACED THE PROBLEM TO A FAULTY HYDRAULIC QUANTITY TRANSMITTER. MAINTENANCE REPLACED THE TRANSMITTER AND PERFORMED OPERATIONAL CHECKS IN ACCORDENCE WITH THE MAINTENANCE MANUAL. THE AIRCRAFT WAS RETURNED TO SERVICE.