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The damper is behind the air filter, the pressure regulator is behind the heater blower motor. The damper could probably be replaced with the motor in place removing the air filter as Bruce suggested, I think the pressure regulator would be more difficult.
If I was going to replace the regulator without removing the motor, I would remove the fan motor, air flow and air filter but it's going to be really tight and you are going to limited or no sight, minimal clearance and reaching way in the back.
Is it DIY? Well that really depends on you and your skills. If you do decide DIY, then Bruce is giving good advice and address a few other things (rubber parts) while you are in there.
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Greg
86 Coupe (stock - pretty much like Butzi designed it) - gone, but not forgotten
65 Ducati Monza 250 & 66 Monza Junior (project)
"if you are lucky enough to own a Porsche, you are lucky enough"
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