As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AIR INTERRUPTED BACK TO DFW AT 390 R/H COWL ANTI-ICE CMAE ON. RAN THE CHECKLIST LIGHT, DID NOT EXTINGUISH. DECLARED AN EMERGENCY. REMOVED AND REPLACED # 2 ENGINE COWL ANTI-ICE VALVE IAW AMM 30-21-11. SECURE CONNECTOR ENG.ANTI - ICE ON #2 ENG OPS CHK OK IAW AMM 30-21-00.