I'm a former York International employee and have many service information letters and service bulletins. I am search of one I don't have. It's the one that tells about the phasing out of the 6-spring seal and phase in of the "bellows" style seal in the YT chillers. This letter probably came out between 2000 and 2001. It tells that chillers built after a certain date would contain the bellows seal. It also mentioned that a "B" was stamped on the shaft seal cover near the 10 o'clock position.

Can anyone help?