As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS SMOKE REPORTED FROM RIGHT TIRE AREA. HYD SYSTEM B FLUID INDICATION, SUSPECT HYDRAULIC LEAK. EMERGENCY WAS DECLARED. MAINTENANCE FOUND NR 4 BRAKE HYDRAULIC COUPLING / LINE LOOSE. REPLACED COUPLING IAW AMM 32-41-11. OPS CHECK GOOD / LEAK CHECK GOOD.