where is TCM(transmission control module) located?

[wango]

hey guys
My 94 325is has developed a tranny issue.

Oftenly auto tranny sticks on 1st or 3rd gear and never shift up until I manually downshift it to '3' and put it back to 'D'.

I've been searching for this issue and found some posts regarding this.
most of them said that TCM(transmission control module) needs to be replaced or reprogrammed.

What i'd like to know is

1. where is the TCM located?
2. is it possible task for a weekend mechanic(me)?
3. if not, how much would it cost at an independant bmw shop or AAMCO or even dealer$hip?

thnx in advance.

[wango]

damn what a stupid man i am! When i used to disconnect dme, i wondered what another module is for yeah that's tcm. i gotta check solenoid of mine as soon as i get up tomorrow morning.

[bad man working]

Yes that is the gearbox ECU but you’re probably bet getting a main dealer to re-programme yours first it only take minutes they’ll probably charge 15 minute labour the control units rarely go fault it’s normally software faults