Try the gray foundation crack sealer. Gutter guys used to use it to seal up gutters. It will seal about anything. I used it once to seal up a rusted out washing machine tub. It worked great, but stunk up the basement, so it is not great to use inside. $5, dry it off, blob it on, and you are done.
The flexible PVC over time has some expansion. Pros fix it by cutting it back to good surface. This is going to sound crazy but how they do it.
Most jet and jet bodies are obsolete, or have to be ordered. Even when new are avaliable changes have been made. IE switch in appearance.
They want to charge a service call. Charge by the hour after the arrival, so fix it in the same call and get paid.
Believe it or not they after cut back carefully peal the old PVC out the jet body. Then lightly sand it. Prime and Re-Glue it with what is called Hot Pool PVC Cement.
Small Spade screwdriver slowly work as around until all PVC pipe is Pealed Out.
Yes I have done it. At least 50 times.
There is maybe 8 inches of that PVC between where it leaks and the next jet, so not a whole lot of wiggle room there
Since it is all PVC I thought of buying a slip coupler and cutting it in half, putting that over it, right up against the jet and glue it all together
Keep it on place with a hose clamp and hope it all fuses together, but the more i this l about it, the more Im leaning towards a professional