Have a new crack in the roof (photos attached). Looking for advice/best methods for repair. The roof is sagging slightly in the area under the crack, but I am more interested in just getting it sealed. Will Eternabond tape be adequate? FYI, I had the pup in for maintenance at a local dealer and looks like someone stepped on the corner and just crushed/cracked the roof. Naturally, they denied it. Any help is appreciated...thank you!