What was found
SWITCH GAUGE ON FIRE EXTINGUISHER BOTTLE HAS INTERNAL SHORT. SHORT IS NOT DETECTABLE BY SWITCH GAUGE CHECK PROCEDURE IN FIRE EXTINGUISHER OVERHAUL MANUAL. TO DETECT A DEFECTIVE SWITCH GAUGE, CHECK PINS 1, 2, AND 3 FOR CONTINUITY WITH THE GAUGE CASE. IF ANY PIN HAS CONTINUITY WITH GAUGE CASE, SWITCH GAUGE IS DEFECTIVE.