As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LNDG IN JAX "CTR HYD QTY" EICAS MSG ILLUMINATED. TURNING ONTO TAXIWAY, QTY WENT FROM 4.0 TO 0.0 AND LOST NOSEWHEEL STEERING. TOWED INTO GATE. LEFT AND RIGHT HYD SYSTEMS NORMAL. CA FD COUPLING BETWEEN ADP ASSY AND PRESS LINE BROKEN. REPLACED COUPLING PER MM.