What was found
SELECTOR APPEARS TO BE ORIGINAL BY RECORDS RESEARCH. ELECTOR VALVE WAS NOT DETENTING. UPON DISASSEMBLY, SPRING LOADED DETENT BALL WAS FOUND SEIZED IN ITS CHANNEL AND WAS DIFFICULT TO FREE. REASON FOR SEIZING WAS DUE TO CORROSION ON BALL. RECOMMEND PERIODIC DISASSY, INSPECTION, AND CLEANING, AS THIS OCCURRED BETWEEN ANNUALS AND WAS OPERATING PROPERLY BEFORE INCIDENT.