As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ENGINE START PILOT NOTED A LOUD VIBRATION COMING FROM R/H EMGINE. PRIOR TO TAKE-OFF HYD PUMP 2B CAUTION MESSAGE ILLUMINATED. AIRCRAFT RETURNED TO GATE AND HYD LOW PRESS ILLUMINATED. MAINT. FOUND THE ORING ON THE RESERVOIR END FITTING BROKEN.