2007/8? Jettsetter Charred Board

[beasuperman]

Hi,
I’m first time user of this forum.
I have 2007 or 8 Hot Spring Jetsetter and it seems that board caught fire and got charred while running the tub (I had cleaning cycle on to heat up the water to be ready). It would be much easier to explain if I am able to attach the photo but I do not know how...
Have anyone had his issue (cause/fix), or know of this concern and replaced the board prior to get torched? I would like to understand what caused this and what need to be fixed to get the old tub going again or even worth fixing it.
Thank you for your help in advance.

[Hottubguy]

Loose wire?

[beasuperman]

Thank you for the suggestion.
There is no fuse in the circuit to prevent the board to catch fire? Just need to replace the board?
All owners should tightens the wire every once in a while? Which wire for what frequency recommended?
Thank you.