I have seen the connection of the led bulbs to the circuit board go bad.  To
determine if this is the problem you should only need to gently wiggle the
bulbs and they should light up intermittently.  It could be that the bulb or
bulbs that indicate your current water and battery levels are out though it
is unlikely that they will all be out.  This is easy to fix if you know how
to use a soldering iron (don't overheat the board).

Jonathan Poole
'82 ac westy