As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASCENDING THROUGH 10-11K RECEIVED NWS INOP CAUTION COULD NOT EXTINGUISH. RETURN TO DEPARTURE. (ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED) PERFORMED OPS CHECK OF NWS ECU IAW AMM 32-51-10-05. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME. (CLOSED)