Newbie needs Autobox help

Fault symptoms are:

Does not shift from 1st to second (goes to rev limiter), lifting off will allow it to drop into 2nd.

When in 2nd hits around 3000 then looses drive and hits rev limiter, also happens if you use kickdown (very embarrasing).

The only way to safely overtake is to drop out o/d and hit hold button, otherwise your going nowhere.

TPS connections cleaned, TPS voltage set to .42v, did also have revolution sensor fault indicated but turned out to be corroded connector in engine bay.

Both engine and gearbox ecu now showing no fault codes.

Fluid looks Ok no burnt smell.

Checked online manual but no combination of above fault :headvswal s.

Thanks in advance, Paul. :headvswal