As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS AIR/GROUND FAIL IN FLIGHT,RED CAWS "CAB PRESS", "AIR/GND","PROP LOW P" AMBER "PUSHER". RESOLUTION TO CORRECT THIS SITUATION IS AS FOLLOWS: INSPECTED WIRING FROM LEFT AND RIGHT "WOW" SWITCHES TO TB 123 AND TB 124, NO DEFECTS NOTED. COMPARED RESISTANCE READINGS OF RIGHT "WOW" SENSOR TO NEW SENSOR. READINGS WERE SIGNIFICANTLY DIFFERENT. REMOVED AND REPLACED RIGHT MLG PROX SWITCH. ADJUSTMENT/TEST SATISFACTORY IAW AMM 12-A-32-30-00-00A-903A-A AND 12-A-32-10-00-00A-903A-A.