As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT AFTER ENGINE START, TOWER SAW SPARKS NEAR THE LEFT ENGINE. CENTER AIR DM AND PRESSURE LIGHT ILLUMINATED. WHEN ELECTRIC PUMPS OFF AND ADP ON, ZERO HYD PRESSURE. REMOVED AND INSTALLED THE TURBINE GEARBOX ASSY AND HYD PUMP IAW AMM 29-11-03 AND HYD PUMP IAW AMM 29-11-03. OPS CHECKED GOOD. R & R OVERSPEED ECC FOR THE ADP IAW AMM 29-11-69. OPS CHECKED GOOD.