As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE ALTERNATE POWER CHANNEL B CIRCUIT BREAKER TRIPPED. ACFT GROUNDED. INSPECTED AND RESET CIRCUIT BREAKER WITH NO DEFECTS NOTED. PERFORMED NR 1 ENGINE START AND CIRCUIT BREAKER TRIPPED AGAIN. R & R NR 1 ENGINE EEC IAW AMM 73-21-60-00-801-F00 AND 73-21-60-400-801-F00, ALL SYS TEST PASSED. PERFORMED NR 1 ENGINE START WITH NO DEFECTS NOTED. OK FOR SERVICE. EEC AND SOFTWARE VERIFIED. ALL SYSTEM GROUND FUNCTIONAL TEST GOOD.