I can well understand..
While not the same, my air recirculate flap/valve on my 405 broke where the stepper motor that locates the flap inserts into said valve.
It too requires a complete dash disassembly and removal of everything up front, dreadful thought having someone do that to my fattie, so I opted to undergo the repair myself, quite literally through a keyhole, without removal of the unit.
I am not small in frame, I did get the job done, it has been working accordingly for the last 2 or 3 years, but if it gives up once again I'll simply mechanically shut the valve as recirculate, permanently..!!
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