What was found
FUEL WARNING LIGHT WOULD NOT INDICATE WHEN A/C WAS SHUT DOWN, IT IS SUPPOSE TO UNDER NORMAL PROCEDURES. SWITCH WAS REPLACED WITH SAME PART NUMBER AND CORRECT AS PER IPC. NEW SWITCH ALSO WOULD NOT WORK. A SECOND NEW SWITCH WAS TRIED, IT ALSO DID NOT WORK. AFTER CONVERSATIONS WITH BEECHCRAFT TECHNICAL REP, IT WAS DISCOVERED SWITCH HAS A VENT HOLE SHOULD BE OPEN TO ATMOSPHERE. FAILING SWITCHES HAD METAL TAG THAT COVERED THE VENT HOLE. SUSPECT SWITCHES HAD TAG REMOVED AND THE SWITCHES WERE TESTED AND FOUND SERVICEABLE. INFORMATION WAS FORWARDED TO BEECHCRAFT AND THEY ARE INFORMING THE VENDOR OF THIS ERROR.