As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT 10TH DUCT IN FLIGHT FOLLOWED CHECK LIST IT DID NOT GO OUT. DELCARED EMERGENCY AND RETURNED TO ATC (AFTER T/O ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED AS A PRECAUTION) FOUND SENSING ELEMENT A48WK BROKEN. R & R SENSING ELEMENT A48WK IAW AMM 36-21-04. OPS TEST OF BLEED AIR LEAK DETECTION AND WARNING SYS GOOD IAW AMM 36-21-00. NO FURTHER DEFECTS NOTED AT THIS TIME. (SDR CLOSED)