Yes, in your first picture (3618) it's the little Allen grub screws that need to be loosened. Once that's done, as Mike says you can slide the larger part of the top cover backwards far enough to lift the front of the panel up. Leave the ones on the side panels alone for now, they don't need to be removed for normal repairs. The ones in pic 3620 are two of the four you remove to take the faceplate off, the other two are on top and will be exposed after you've removed that larger panel first.
Be aware that there are LOTS of little parts that will try and launch or fall out and try to hide the first time you take the faceplate off, so I'd leave that alone unless necessary.
If you drop your email in a private conversations thread with me, I'll send you over a couple of instruction sheets for getting the tuner apart and typical part replacement work to do along with other repairs to look at while you're inside the tuner.
John
(packrat014 on eBay)