I have been contacted by a customer with a Trane RTWA. He asked me for some advice on the oil filter canister. A few weeks after Trane has replaced the filter, the canister starts leaking oil. I suspect the o-ring gasket is the issue but he wants to have a general relacement of the filter system because this happens every year (even when they fix it under warranty). I thought about a compact replacement filter with flare connections (i thought i have seen something on the Carrier chillers). Does anyone know a manufacturer of such a filter?