Hello and welcome
Transalp is a reliable bike (motor) so you have to check all others parts and oil change, valve clearance, carburetor synchro, distribution, air filter, pads and front disc, rear lining, brake fluid drain, fork drain + change of oil seals, chain kit...
I will prefer a more recent model double front brake etc ...
Seems (view from here) a little bit too expensive for this age ( not too much kils if real)
Sure here some/most of us had a TA but it is the Big sister family here ...