There is a video by Chris Venter showing replacing the worm block.
I don't think you need to remove the worm block just to regrease it. With the PME you simply exercise the mount and use a stiff artists brush (Bunnings sells them in the paint section) and get out the old grease then add in the new in reverse. It takes about 10 minutes tops each worm.
The belts should not fray. If its shedding material it gets on that little gear on the end of the motor and can cause PE bumps and spikes.
The bad ones were black the new ones are grey although my PME has black belts. They seemed in excellent condition. The grey ones for the PMX are higher quality and do not shed or fray. How old is your PMX? SB says to regrease once a year.
If you change the belts you'll need to clean out the shedded black rubber bits from the gears with something pointy.
Also if you do remove the worm block you need to put some masking tape on the end of your Allen key or use allen keys that are magnetized otherwise getting that long screw to go in horizontally all that distance is next to impossible and it can fall inside requiring heroics to get it out (I did it twice!).
Greg.
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