I purchased a second hand 071 class loco from an ebay seller earlier this year. The loco had been running fine on my DC track, however it has now stopped working. I have a Gaugemaster Model D controller unit, the LED on the unit glows red when the loco is placed onto a powered track. Normally the LED should glow yellow. In addition I can feel heat at the top of the loco body. Any ideas what's causing the problem and is there anywhere in Britain where I can send the loco off for a repair?