As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: UPON REACHING CRUISE ALTITUDE, NOTICED AGENT 1 DISCHARGE LIGHT ILLUMINATED ON ENGINE 2 FIRE PANEL. MAINTENANCE REPLACED ENGINE / APU FIRE PANEL PER AMM 26-12-12-000/400-001-A AND 26-21-00-720-005-A. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.