As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - ON TAXI FOR FLIGHT 4321, RECEIVED A HYD 1 PUMP CAUTION. RETURNED TO THE GATE. FOUND HYDRAULIC PUMP I/B C/B POPPED ON ACPC. RESET CB AND PERFORMED OPS TEST OF IB PUMP IAW CRJ 700 AMM TASK 29-10-00-710-801 OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.