Left heated grip stopped working...

[DDT Rider]

2008GSA
I've done a search and am looking for a thread I read a long time ago. There was a fellow whose solder to the grips broke and he merely re-soldered and had them working again.

Before I take the side apart, I'd like to read up on it. Anyone know of the thread I'm talking about, or a similar one. The only ones I can search up are those with both sides out, ZFE problems, etc.

Happy for any assistance pointing the right way.

Cheers
Jim in Japan