I did this over the winter on an MC7300 which is very similar to your amp. If I remember correctly, just remove the top and bottom screws and then whole assembly slides out. I may have loosened a few other screws on the side panels where the front assembly meets. It is a little tight for sure, but I was able to get it out. Be careful!! The glass will break if you put too much pressure on it.
Good luck with your upgrade. I did just the warm white LEDs and while they work great and keep the heat down, the color of the meters is off a little. I need to get new gels like you did at some point to even the color out with my other newer gear. Also, the lettering is not quite as green as my newer pieces, but it's also not *that* noticeable either. There is a seller with green LEDs that are designed to deal with exactly this.
-Matt
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