As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, AFTER ENGINE START, RIGHT HYD QTY DROPPED SIGNIFICANTLY AND REFILL INDICATION CAME ON. AIRCRAFT RETURNED TO BLOCKS. (BTB). ACCOMPLISHED WALKAROUND OF A/C, NO SIGNS OF LEAKS. SERVICED RH HYDRAULICS IAW B767 AMM 12-12-01. MONITORED ENGINE START, ALL INDICATIONS NORMAL. AIRCRAFT RETURNED TO SERVICE.