As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON CLIMB OUT RECEIVED RT 10TH ST DUCT MESSAGE. C/W QRH. MESSAGE REMAINED AND THEN EXTINGUISHED A FEW MINS LATER. ONCE ON GROUND, BRIEFLY APPEARED TWICE ON TAXI. ECS SYNOPTIC SHOWED RED FROM RT SOV UP TO PACK PRESSURE. AIRCRAFT REMOVED FROM SERVICE. TROUBLESHOT AND FOUND RT 10TH STAGE MANIFOLD LOOP B SENSING ELEMENT A12WK SHORT TO GROUND INTERNALLY. REMOVED AND REPLACED SENSING ELEMENT A12WK, REF AMM CHAP 36. OPERATIONS CHECK GOOD AT THIS TIME.