As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. HYD B SYS LO PR ECAM 3 MINUTES AFTER DEPARTURE. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. ACCOMPLISHED SYSTEM OPERATIONAL CHECK OF HYDRAULIC B SYSTEM. HYDRAULIC QUANTITY AND PRESSURE WERE NORMAL WITH FLIGHT CONTROL RESPONSE AND PRESSURE SYSTEM CHECKS, PER AMM 29-12-51. NO ECAM MESSAGES NOTED, AIRCRAFT OK FOR SERVICE.