GW-Instek GDS-2000E series circuit diagram

[Krisztián]

I'm looking for a GW-Instek GDS-2000E series circuit diagram (input stage is enough for me).

For more info please check out that post: https://www.eevblog.com/forum/testgear/gw-instek-gds-2000e-teardown-short-review-comparison-with-rigol-ds2000(a)/msg3853784/#msg3853784

Would like to improve DC behavior of my scope. Probably cascoding of input stage BJTs will help.

Thanks!