As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT REPORTED, RT GEN RELAY WAS CHATTERING. TOOK THE RT GEN OFF LINE AND THE BTC WOULD NOT COUPLE. DEPARATED DCA TO JFK AND DIVERTED TO BWI. NO EMERGENCY WAS DECLARED AND NO FURTHER INCIDENT. REMOVED AND REPLACED GENERATOR CONTROL UNIT, OPS CHECKS GOOD.