thanks to all for replies. LEDs are used by Bachman and are surface mounted devices. Looking inside I find that they are just not very bright and the task if replcing them looks like a job for a brain surgeon. The leds are mounted on tiny pc boards attached to the main board. Apparently this part or parts are not available from Bachman.
I consider this to be a defect but Bachman will only replace the entire loco, which does nothing because they continue to use the same incorrect leds.
I consider this to be a defect but Bachman will only replace the entire loco, which does nothing because they continue to use the same incorrect leds.