As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SWITCH HAS CONTINUITY WITH NO AIRPRESSURE ON DIAPHRAGM. MICROSWITCH MALFUNCTION. RECOMMEND SWITCH BE CHECKED EVERY YEAR OR ANNUALLY. THIS 09E47-2 IS PART OF THE 10E21-X HEATER PACKAGE IN PIPER CHEYENNES. THIS SWITCH IS NOT COVERED UNDER AD NOTE 96-20-07. PART DESCRIPTION IS: AIR PRESSURE REGULATOR AND AIR PRESSURE SWITCH.