GBH 36V li speed & power problems

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Electrical installation
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Hi, I have a 36v GBH V-LI SDS drill that is at least 10 years old, for about 5 years it had very little use, been using it again the last 6 months with no problems, came to use it last week and it had low power and speed, I have charged all batteries again and used them in other 36v tools and they seem fine so I beleive the problem is with the drill, so far i have checked the follwing with no improvement, Brushes OK, clenaed up comm, blown out all dust & debris from the housing, cleaned battery connections.

I have bought a replacement but would like to know if it could be an easy repair or is it for the bin ???

Thank you

This post was edited by on 13.03.2021, 15:16 o’clock
Reason: spelling mistake