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To finish replacing the oil filter housing and oil cooler, I have been attempting to remove the intake manifold this morning.
I just got WIS, so I'm following the MB process and watching a tonne of videos to help me out.
I have successfully removed all eight bolts, with the exception of one that is inaccessible since it is too close to the oil filter housing.
The numerous hoses and pipes have also been unplugged, in addition to all five electricity connections.
Various hoses and wiring harnesses are not clipped, etc.
At the engine's back, the manifold is loose and moves smoothly, but up front, somewhere behind the power steering pump, it's stuck and won't come out!

Am I missing anything? Has anybody else experienced this problem?

Steps 8 and 9 below seem to be where the problem lies, therefore I'm crossing my fingers:
an) Take the poly-V belt off Should the need arise (AR13.20-P-0001CW)
9) Remove the bolts from the power steering pump and set it aside with the cables attached. In case it's needed (AR46.30-P-0500EVO)
Knowing when it's needed would be great! Maybe that matters because mys has the 213 SPEED-SENSITIVE POWER STEERING/VARIO STEERING option.

When round 2 begins, I will consider this possibility.

Helpful suggestions are welcome.

It appears that I may have overlooked one bolt as Mercedes's EPC for my VIN indicates that there are nine, however WIS only shows eight. Tomorrow I have something else to look into.

Apologies, I made a mistake. Yes, nine bolts are there. WIS's diagram is a bit perplexing since it only shows eight points, but it does remind me of the one I missed (at the front), but it doesn't show the problematic one by the oil filter housing. After removing the additional bolt, the manifold became loose but remained stubbornly stuck; hence, I decided to go back to steps 8 and 9 in the hopes that the power steering pump would release its grip. However, I then encountered a Catch-22 scenario. It was easy to remove the V belt and the front two bolts that held the pump in place, however the third bolt in the back is inaccessible due to the intake manifold! Did anyone else do this, and if so, how?

You can remove the intake manifold without releasing any pressure on the power steering pump. In order to remove the intake manifold, I was unable to locate any videos or descriptions of the process.
So, aside from the one bolt I failed to see, the issue was a single renegade knot that was difficult to reach and was blocking its escape. Looking forward to it returning without a hitch!