Hi all question for the tire experts. Have a friend that has multiple bikes. Has a Honda CTX with a air leak in rear tire which I can’t find. On two occasions went to ride had15 lbs… started out with 41. He ie guilty of not checking to often enough. 26 lbs over a little over a month? a bathed the tire in soapy fluid carefully inspected the valve around rim and valve core, carefully inspected the tire. Has anyone I encountered a situation as such. I would have removed the tire and placed in a tub of water is the only other diagnosis tool left.