Rebuild of section of timber wall is complete.
Demolition of rest of timber wall and three sections of pool deck is in progress. Renovation is necessary because of poor construction on timber wall including lack of drainage. Because improper fill dirt was also used, there was inadequate compaction of soil. Sections of pool deck were also poured as much as ten inches thick in some spots! This created addional stress on wall and everything combined was causing pool deck to shift away from the pool shell. There's more to come!
Was it rotted or just pushed out from the weight? Sorry I am bugging you asking all these questions, we construct retaining walls(and sub out concrete) and I am always about finding out what makes things go wrong.