I think you need to get it into a facility that can give you a good, sound answer. Separation and spongy spots on a roof are nothing to mess with or delay corrective action. Regardless of how serious it is at this time, if it is a problem, it will simply continue to degrade with time.
Days camping (2016)----181 days
Days camping (2017) --- 82 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
11 different RV's