Welll, I don't know the amp at all, so no real help here, though you have played it a bit, would it work for the gigs that you have in mind for the next year or 2?
If you could be happy with it then I would repair it.
If you have issues with it, what are they? (Besides the things you already told us about.)
Anyway, my 2 cents, welcome to this little corner of the internet.
P.S. Don't get a DSL401 Get a 6101