As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START, NOTICED THE "AUX PITOT" LIGHT ILLUMINATED. FOUND CIRCUIT BREAKER TRIPPED. ACFT GROUNDED. CIRCUIT BREAKER D6 ON P18-3 OUT. GVI BEHIND P18-3, IAW MM 20-60-01. NO DEFECTS. REPLACED AUX PITOT PROBE IAW MM 34-11-01-000-801 & 34-11-01-400-801. OPS NORMAL IAW MM 34-11-01. ETOPS GROUND VERIFICATION TEST SUCCESSFUL.