A slow leak in a tire. Faulty valve stem. The technician replaced and refilled the tire. Then took the extra step to confirm the problem was solved. Discovered the bead had not secured itself to the rim. Brokedown the tire again, added sealant, and voila. Knopfler technicians are so thorough and experienced. I love the service they provide. And as always, a shout out to my service advisor, Tom Murphy. I call him a trusted friend.