2-3 Shift Flare

[tjpops]

My 14 month old transmission rebuild is flaring on the 2-3 shift again ... I really don't want to do the transmission again - only 12,000KM on rebuild! Hopefully it is something else. I've searched posts and see things about TPS and a solenoid behind the battery. Can anyone get specific on these things for me? Where do I find the TPS? Is it something I can test/adjust/clean? How about the solenoid - exactly where is it and is there anything else near it that might confuse me or cause problems if I make a mistake? Does bypassing this solenoid put anything at risk? You can tell I'm a little nervous but any help is appreciated - thanks!