Troubleshooting a sprinkler system

My house came with an older sprinkler system. The control box is a
Rainbird CRC-6. I used it earlier this summer with no problems. But
two weeks ago my controller just displays the number "8". No buttons
work or anything. I disconnected the power but when I connected it
again I got the same thing. I checked the connections on the station
valves, and they seemed solid, although there is a lot of mud caked in
where the wires are joined.

I found a PDF manual off of Rainbirds site but it was no help. Does
anyone have any ideas?
.

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