Core UDC-20 Charger problem

[Si Coe]

OK - I think I've blown the balancing facility on my UDC 20. It charges fine, Lipo, NiMH etc are all ok, but when you try and use the balance charge it tells you 'low cell error' and thats on every single one of my Lipos (8 2S and 1 3S). I'm sure they aren't all faulty, so I suspect the charger is the problem not the cells.
The problem is its my only charger and I need it! Since it still works, just doesn't balance I'm left with a dilemia. Do I:

1) Just use it and not worry about balancing. All the cells were balanced last week so are fine atm.

2) Carry on using it but get an external balancer like the Trakpower V-Balancer

3) Buy a cheap balance charger, use that at home to balance and use the UDC for racing in non-balance mode - something like this is what I'm thinking. Slow doesn't matter here.

4) Send the UDC off to be fixed. Means no charger for a while, but with so many cells I could do 2 meetings without it just about. But where to send, how much and how long? Any longer then 2 weeks is a problem unless I can source another charger.

So what should I do?