Mike - This happened to my rig. Although my rig's a bit longer, I would think the roof structure is the same. On mine, the roof rail on one side was pulled away when the slide came out, and it tore the roof. It turned out that the line mechanic had his gun torgue too tight and had broken most of the screw heads off. I can't be sure if your situation is the same, because I can't see the cross-section of the rail end, and I see no evidence of screw holes, but I think these rails should be screwed into a backing plate behind the wall. Then the one-piece roof "tucks" over the crown and into the top channel or groove in the railtop on each side, being primarily held in place by pressure. Then when both sides of the roof are tucked in, a bead of adhesive caulk is run down both edges to seal it. I would be all over Winnebago on this! And I would fight to get it done right. I hope some of this might help, and good luck!
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'07 Itasca 35L/W22 FULL-TIMING
1000 Trails - VFW - 5 Yrs Army
"NOT ALL WHO WANDER ARE LOST"