The reason I asked my first question was because I was afraid I would destroy my miner by changing the PLL.

I redused the PLL and the miner got a lot cooler, and I was able to do some more digging before it shutted down.

In the interface I noticed one of the fans had a really low RPM, and after dissasembling it, I noticed the fan did not work at all.
The fan on the PSU doesnt work either 

The provider of this miner told me it had been running for 2 months, but I have a feeling it has been used for a long time. Is there any way I can check for how many hours the miner has been running in total?