As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L BLEED DUCT WARNING CAME ON IN CRUISE FLIGHT, FOLLOWED BY RAPID DECENT TO 10000' FOLLOWED QRH CHECKLIST SUCCESSFULLY. AIRCRAFT LANDED UNEVENTFULLY. REPLACED ELBOW CONNECTIONS LT BLEED LOOP A, MT137P2, MT202P2, AND LOOP B MT203P1 IAW AMM 36-21-01 OPS TEST GOOD P/N ON/OFF 35201-9MT SEE NRWC 630626 FOR DETAILS. EMERGENCY WAS DECLARED BY THE CREW.