My print bed is having heating issues. The “internal” bed is only heating up to 57-58C while the “external” is heating up to any temperature I set it to.

All the wiring I can see is intact and snug. The printer hasn’t been dropped or anything like that.

I did a factory reset and the issue was still present. I updated all the firmware and still had the issue.

I’m pretty sure something is wrong on the inside but this is my first printer and I have no idea what I’d be looking at/for once I start taking it apart.

Any advice, links to tutorials, et cetera, will be appreciated.