Sounds like a couple of new problems. Don't let it discourage you. The lamp issues could simply be connector issues on the Lamp Driver board. Just reseat the connectors and if there's improvement, then that will be the issue.
Every digit is a "5" or "7". Hmm.. Could be the connectors on the MPU board.
Looks like a CLASSIC case of connectors on the boards or pins within the connectors.
