Went back to look at this WOZ today and game would go through the usual shut downs, resets when hitting the right flippers. I disconnected the lower flipper and tested and it continued, then disconnected the upper right and the problem persisted. Upon inspection of the flipper for the castle playfield it appeared that the right spade connector, looking at it from under the playfield, was loose. I reconnected that, reseated the connectors on the board nearby and unscrewed that board from under the playfield. Game played 100%.
Used some foam under that board to work as a shock absorber and screwed the board back in. I was able to play a complete game, the first on this table, and everything worked 100%.
Thanks to everyone for suggestions and especially pointing my directions to the connectors. Hope this owner gets some good quality time with their now working WOZ.