The LEDs are mostly red

If the LEDs are mostly red, and the other colours have faded away, then your batteries need replacing.

Brand new batteries, and the turns flash very dim for a mere moment before stopping

This will happen when one of the LEDs is not wired in correctly, however if you look very closely at each LED you will notice there’s a little slit on the positive side of the LED. You can use this to check your LEDs are in the right way around.

A different problem?

If you've had a completely different problem and not sure what to do, then please feel free to contact me and I can do my best to help you work out any problems you might be facing.