As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI LEFT ELEC CIRCUIT BREAKER POPS W/LT ELECTRIC DEMANDPUMP SELECTED ON, AC RETURNED TO GATE (BTB) AND MTX GROUNDED AC .MTX TROUBLESHOT AND RE-PINNED PLUGS D4012P +D4012J IAW SWPM 20-61-00 . AND REPLACED HYD PUMP ASSY. AND PERFORMED OPS CHECKS IAW B 767 AMM 29-11-01 OPS AND LEAK CHECK GOOD . MTX RETURNED AC TO SERVICE