As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DE-ICE PRESSURE CAUTION LIGHT. LT OTBD WING STATUS 1-2 DID NOT ILLUMINATE GREEN WITH BOOTS IN FAST OR SLOW MODE. DEICE PRESS 18 PSI (OAT -38 DEC C FL250). DIVERTED FLIGHT, LANDING UNEVENTFUL. REMOVED NR1 DDV LT WING, REF AMM TASK 30-11-16-000-801, REPLACED REF AMM TASK 30-11-16-400-801, PERFORMED OPS TEST REF AMM TASK 30-11-16-710-810, OPS CKECKED GOOD. RETURNED TO SERVICE.