As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE WEDGE PN 65C187-001 (LENS) IS CRACKED IN THE BEZEL ASSEMBLY (PN 1U202-007) OF THE AIRSPEED INDICATOR. IT APPEARS THE LIGHT ASSEMBLY USED TO PROVIDE INSTRUMENT FACE BACK LIGHTING IS CAUSING THE CRACK DUE TO THE FACT THE LENS/WEDGE IS MADE FROM A POLY-CARBONATE MATERIAL, AND THE TEMPERATURE OF THE LIGHT. THE CRACK IN THE WEDGE/LENS THEN CAUSES A STATIC SIDE LEAK OF THE INSTRUMENT. INSTRUMENT IS APPROX 7 YEARS OLD.