Mmt Gearbox Fault

[calla]

hi all. im new to the site , and im hoping someone out there can shed some light on this problem.

its a 03 1.0ltr yaris with the mmt box.the car drives fine in easy mode but will not up or down the gears in manual mode. when manual is selected ist gear is show,

toyota dealer did a diagnostic check, this was inconclusive. first, the gearbox was not recognised by the diagnostics, the conclusion, a. wiring fault b. a faulty gearbox ecu. ( the consensus being an ecu fault)

given the £500 + for the part alone im thinking, can these ecu s be repared? also, what the issues with used parts from the breakers?

any thoughts welcomed