Hi Jerry,
The problem is that low voltage spots run off transformers that can fail like a bulb due to too much power running through suggesting bad installation intially, suggest replacement transformers and fittings. We have had this exact issue with a recent client who had exactly the same problem in her kitchen. Costs around £20 for transformers (both) and fittings will cost whatever model they are if still made. Labour costs are £40 per fitting, estimate is around £100 plus cost of new fittings. Some come with transformers so shopping around or coming to us will make it cheaper for you. Magic Touch