We have found many of these leaking...dumping the entire charge. All on RTAC units and all on units less than 3 years old. Mostly finding them leaking thru the stem but twice found leaking at flange. I heard from a Trane guy about putting washers on the flange bolts because they found on some the bolts were bottomed out. But finding several leaking thru stem is raising an eyebrow. Anyone else finding this or know of a service bulletin?