As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/RIC - FLT 6234 - DURING TAXI AT 1235 HOURS ON 7-8-97, RETURNED TO GATE DUE TO NR 1 TRANSPONDER TRIPPED CIRCUIT BREAKER AND WILL NOT RESET. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE OPENED DMI 46317, MEL 34-1. MAINTENANCE CLOSED DMI 46317 ON 7-8-97 BY REMOVING AND REPLACING COM UNIT. OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)