Last question first, easy fix - sure why not!
I don't have any info on the CP30 but I'm guessing it's close to the 31 in design.
The fan in the 31 is supposed to keep some of the condensation down, make sure it's running. Although with run away temps it might not help much.
Sounds like the temp control pots have become very touchy maybe intermittent. Control pots and moisture are never idea. Here is the easy fix. Find some good spray cleaner for the pots and give it a try. Give them a good spin while cleaning after everything is dry try again and see if it worked.
If that fails then the next easy fix will likely involve a soldering iron.