Hi all i could use some help, we have a cantilever deck and not traditional coping. The pool was already built before we bought the house. It’s maybe 10-15 years old. We resurfaced it with pebble tec, and 2 years later were noticing a crack underneath the tiles several builders said the pool needs to be rebuilt and its a loss then others said they can cut the decking to make an expansion joint and repair the crack wether its the bond beam or just a cosmetic crack. What do you guys suggest. Thank you