Ralph Farr wrote in message

Thanks for your reply Jim - I had never thought about using LED's but
that is something I would definitely consider now.

Ralph

Sorry on the mis-type of your name.

The control chip is, apparently, National MM5387AA/N

Can't vouch for the source, but here you go:
http://www.chipdocs.com/pndecoder/da...MM5387AAN.html

Jim