Not sure if this is useful to anyone but this is the before and after of the loom being adjusted and plug being greased from my m3lr. Sorry it escapes my memory which plug he removed. Pretty sure it was the black one. Took around 15 minutes.
I posted previously in this thread about pressing down the plastic cowl myself so he didn't need to do that however he did state on a previous visit this is something they would have done as part of this work.
From what the tech said: rain water gradually makes its way down to the loom (the wrapped one) entering from under the plastic cowl below the screen when it isn't attached properly and there is a gap. It will sit in the loom and the gradual build up will eventually force it down to the plug. Old plugs are being sealed with grease / sealant, newer plugs have been redesigned to prevent ingress entirely.
the work consisted of roughly:
remove frunk
detach the large section of the loom held with plastic plugs
cut the plastic armour covering that section
visual / touch inspection for water ingress (mine had none)
unplug the black connector (i think)
clear dust in/around connector
apply some sort of grease to the sides of the plug
re insert plug
bind cut loom in some sort of fabric tape
realign thick section of loom against the silver metal braced area
reattach loom plastic plugs
reinstall frunk tray and plastic cover etc