I have an experience that might be similar, though (thankfully) not with my PCar.
My rather pristine Honda Accord Coupe (yes, it was a great commuter car) received a monstorous dent just behind the drivers door. Let's just say my then 6 year old daughter was really nice to me that night, then the next morning I knew why.
No access into this area as it is structural (A-Pillar, I think).
The paintless dent guy comes over, drills a small hole in the door jamb, then after heating the metal, inserts these medieval hooks and things into the body, and 15 minutes later, I can't find the dent. I mean seriously, I'm a picky guy and I can't find any evidence of the dent. He really had a great feel for the metal, how to stretch it back into shape, etc. What a lucky girlfriend he must have. Anyway, a plug goes into the door frame and it looks great.
The secret was finding a real pro in the paintless dent remval circus. Seems that anyone with a VCR and $100 to "Al's School of Paintless Dent Removal and Taxidermy" can say they are a dent removal specialist. I found my guy by calling the high-end car dealers around town (the Porsche and Mercedes crew) - they all recommended him. Seems that when a new 996 gets dinged, he undoes it for them.
If you are in Southern California, drop me a line and I'll pass his name/number to you.
Sorry for the long post, but I still can't get over what a great job he did.
Good luck!
Don
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don@plumley.org
Das Zoom - '87 Carrera