What was found
DEICE PRESSURE CAUTION ADVISORY LIGHT ILLUMINATED DURING DAILY CHECKS FL250, SAT -30 DEG CELCIUS. NORMAL PRESSURE INDICATED BUT INNER WING BOOT LIGHT DID NOT COME ON. RETURNED TO FIELD. LANDING UNEVENTFUL. C/W FIM TASKS 30-10-00-810-801 AND 806. FOUND FAULT CODE LOW PRESSURE 4A IN CDS. ERASED CODES. C/W VISUAL & TACTILE CHECK OF DEICE BOOTS. NO DEFECTS FOUND. C/W FUNCTION TEST OF AIRFRAME PNEUMATIC DEICE SYS IAW TASK 30-11-00-720-801. RAN TEST 4 TIMES. TEST GOOD. DEICE PRESSURE CAUTION AND FAULT CODE 4A DID NOT RETURN. COULD NOT DUPLICATE DEFECT ON GROUND. R & R NR 4 DDV AS A PRECAUTIONARY MESAURE IAW AMM TASKS 30-11-16-000-801 AND 30-11-16-400-801. PERFORMED FUNCTIONAL TEST OF THE AIRFRAME PNEUMATIC DEICING SYS IAW AMM TASK 30-11-00-720-801. FUNCTIONAL TEST GOOD. NO DEFECTS NOTED. RETURNED TO SERVICE.