As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 155 - KMIA/MPTO, LEFT HYDRAULIC SYSTEM PRESS AND HYD QUANTITY WAS LOST. A/C AIR RETURNED TO KMIA. ON GROUND AT KMIA MAINTENANCE FOUND BROKEN HYD LINE ON LEFT MLG DOWN LOCK ACTUATOR. LINE WAS REPLACED AND SYSTEM TESTED/LEAKED CHECKED OK PER 29-11-00. (M)