I've had the same problem (board losing time, Haywood saying replace the board, pool people willing to do it (but with long lead times and $1k + labor).
Finally found a pool guy who has a Haywood contact who referred to this post and is happy to steer me towards this solution of replacing a capacitor.
I sourced the capacitor - looked at Mouser.com (out of stock as of 2022/07/17), amazon, tti.com, digikey.com ...
Finally ended up buying 2 on ebay
1 PCS Panasonic CAPACITOR SUPER .33F 0.33F 5.5V SUPERCAP Radial Super Cap 2050000757051 | eBay and will be installing next week.
"1 PCS Panasonic CAPACITOR SUPER .33F 0.33F 5.5V SUPERCAP Radial Super Cap"