The tank body of my Sta-right PE5E-125L has a hairline crack that is causing leaking. The part is so old (tag says 1981) I can't find it in any part list, but I am pretty sure that it can be replaced with the Pentair C176-47P1 Tank Body (~$80). The motor is fine, but also old and single speed. I would love thoughts on whether I should bother replacing the part, or just go for a new motor unit. If a new one - which one would you recommend for a 1000 gallon hot tub. If fixing - how to deal with the PVC pipe seal between the tank body and pipe running to the heater. Thanks!