I've seen that not any near cambridge and I'm not 100% it's the motor and even if it is dying then a relocation won't do much.
The motors are bulletproof they cannot die.
There are ones that have been completely encasdd in water for years been brought back to life.
If its losing power then its likely waterlogged in its case.
The guy in Durham will relocate to the boot for £80 iirc.
So it's worth the drive.
He will also top up the fluid. He topped mine up. Could be it needs more fluid.
It's likely waterlogged.
Or of its struggling they can sometimes not fold right and go out of track. You need to make sure you manually bend it into track when someone else hits the button.
Mine won't go fully down sometimes and needs a push at the end to lock in.