What was found
WHILE EN ROUTE FROM AUA TO DED, PILOT REPORTED DURING CLIMB AND DESCENT, ALTIMETER AND VSI WAS ACTING ERRATIC. UPON ARRIVAL TO DED, THE PITOT STATIC SYSTEM WAS TESTED IAW MANUFACTURES RECOMMENDATIONS AND COULD NOT REPRODUCE PROBLEM ON THE GROUND. AIRCRAFT WAS RELEASE FOR TEST FLIGHT TO SEE IF PROBLEM PERSISTED AND WAS INSTRUCTED TO DEVIATE TO SFB TO CE AVIONICS OE4R411IF THE PROBLEM OCCURRED AGAIN. UPON FURTHER INVESTIGATION, CE FOUND MOISTURE IN THE PILOT PITOT STATIC SYSTEM. SYSTEM WAS CLEARED AND RECERTIFIED.