What was found
DURING CLIMBOUT, LEFT AND RIGHT BLEED AIR WARNING ANNUNCIATORS ILLUMINATED. INITIAL CHECKLIST PROCEDURES EXTINGUISHED LIGHTS. BOTH LIGHTS CAME BACK ON DURING FURTHER CLIMB TO FL290 BUT WOULD NOT EXTINGUISH FOLLOWING LIMITED AFM CHECKLIST PROCEDURES DUE TO THE PRESENCE OF ICING CONDITIONS. AN UNEVENTFUL, UNSCHEDULED LANDING AT THE DEPARTURE AIRPORT. MAINTENANCE PERSONNEL FOUND LEAKING COUPLING SEALS AT 2 LOCATIONS IN THE TAIL CONE AREA AND REPLACED WITH NEW.