A friend of mine had a Columbus that had a crack in the classic spot at the forward edge of the bottom of the bedroom slide. Odd yours is at the top.
In my buddies case, there were a crossmember that was to long pushing on the fiberglass that caused it to crack. The service guys cut the fiberglass out in the area and ground off the end of the crossmember and patched the fiberglass. They found no frame issues.
Maybe yours could be similar situation.....that would be good.
What is the make and model of the rig?
2022 Rockwood 2442BS
St Augustine, FL