As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF OUT OF LCK THE LEFT BLEED AIR CAME ON AND A FEW MINUTES LATER THE RIGHT BLEED AIR LIGHT CAME ON, PILOT THEN ELECTED TO RETURN TO LCK. MAINTENANCE REPLACED BOTH PYLON AIR DUCT SEALS AND THE LEFT BLEED AIR TEMP. SWITCH NOW OPS CHECKS GOOD.