Can I add that in recently having my EHA reset (0.4 - 0.45 bar) my M103 has been transormed.

The previous 1800-2000rpm flat spot during warm up has dissapeared and the pick-up is hugely improved. The engine is far more willing and responsive to more throttle. Like a new one!!!!

I may be imagining it but the change-down to a lower gear seems to have improved. Maybe the engine is now able to place the necessary demand on the gearbox forcing it to down-change.

I suggest you try this first.