As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT AFTER STARTING THE NO1 ENGINE THE NO2 ENGINE WOULD NOT START. NO1 ENGINE START SELECT DID NOT ILLUMINATE AND THERE WAS NO ENGINE ROTATION. THE MAINTENANCE VENDOR FOUND THE "B4" CIRCUIT BREAKER ON THE ZL PANEL FOR MAIN START CONTROL TRIPPED. REMOVED AND CLEANED CABLE TERMINALS ON NO1 STARTER TERMINAL BLOCK AND THE REINSTALLED AND TORQUED PER AMM. OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.