What was found
EFIS MISCOMPARE AFTER TAKEOFF. RESULTING IN ERRONEOUS AIRSPEEDS AND ALTITUDES ON BOTH PFD’S AND STBY FD. EMERGENCY DECLARED DUE TO UNKOWN ALTITUDES AND RETURNED TO AUS. UPON INSPECTION FOUND MUD DAUBER NEST IN ALL STATIC PORTS. CONTACTED DUNCAN AVIATION FOR PURGE ADN LEAK TEST FOR AIRCRAFT RTS. OPS CHECKED OK AFTER PURGE. NO SPECIFIC COMPONENT WAS RESPONSIBLE FOR DISCREPANCY. HVAE STATIC PORT COVERS ON ORDER.