I can't believe how lucky I got finding that leak. Fortunately it was not behind or under one of the many boulders set so far and I just filled the pond over night and marked the level with a mason bit and this morning the water was at the same spot. LUCKY LUCKY LUCKY. The repair seemed to have worked even though it was at lap joints and edge of a drop off and a very tight area to work in. BUT IT'S A DONE!!!!!! Back to finishing the pond .