What was found
SEA FLIGHT NR 2276: DEICE PRESSURE CAUTION ILLUMINATED ON FLIGHT. RAN EA CHECKLIST AND LIGHT EXTINGUISHED WHEN SELECTED TO MANUAL. LIGHT CAME ON AFTER FEW CYCLES. DEICE PRESSURE WAS NORMAL ON BOTH SIDES. ALL BOOT ADVISORY LIGHTS WORK NORMALLY. MAINTENANCE REMOVED 613AR IAW Q400 AMM TASK 57-23-01-00-801. REMOVED AND REPLACED NR 2 DDV IAW Q400 AMM TASK 30-11-16-000-801 AND 3-11-16-400-801. OPS CHECK GOOD. REINSTALLED 613AR IAW Q400 AMM 57-23-01-400-801. OPS CHECK OF A/F DEICE SYSTEM GOOD. AIRCRAFT RETURNED TO SERVICE.