As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IIDS WILL NOT RESPOND TO MENU KEY, DIGITAL READ-OUT OR DISPLAY EXCEPTION. CYCLING POWER OFF THEN ON SEEMS TO CORRECT PROBLEM TEMPORALLY. RIGHT TURBINE EGT FLUCTUATION ON DISPLAY LED. CONSTANT IIDS BATTERY FAULT. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.