Help if you can

[higgy116]

I was working on fixing up my A/S again... and I discovered a small spot in the ceiling near my bunk beds that looked like corrosion, so I started to scrape the corrosion off when guess what happened, sparks started to fly. As it turns out the aluminum was corroded all right from a 12V short that has been hidden in the ceiling all these years (it’s a 1972 Ambassador). I was able to get one of the probes from my multi tester into the hole to determine it was a 12V wire that was pinched between the ceiling panel and one of the cross member supports. Now for my problem, can anyone tell me if there is anyway to loosen the center ceiling panel and drop it down enough that I might be able to reach up in there and fix this short? The center panel seems to go the whole length of the cabin and I am not sure how the two strips that run the length of it which seem to hold it in place are held up. Or is there any other suggestions out there, it seems to be in a spot that there is no other access, will I need to cut a whole in the ceiling and then cover it with something? Any thoughts?

Thank you in advance for any help anyone can offer.