so nowhere "speaks" about switching FADEC off (at least on, if any engine is running....) ??????
Doesn't this say just that?
Control switch FADEC ENG I / II of the engine ENG 1 / 2 to be checked -- switch to OFF position
Engine ENG 1 / 2 -- restart in accordance with FLM EC135 T2 (CPDS) / FLM EC135 T2+ (CPDS) as appropriate