After several weeks it now appears fixed.
I got a new extruder from Bambu, and during dissasembly of the old I noticed that some of the fan wires were flattened and squeezed between the extruder unit and the casing, causing the extruder to not sit entirely straight. When putting in the new one I took care to reroute the wires wires properly, and upon
testing it now works flawlessly.
This was a though one to fix, but at least I have some pare parts to show for it after replacing both the bed and the extruder.
