Had same type spots on previous mh, which was just spots insufficiently glued down. No real problems with that one either. Just aggravating to look at, and scary to mash on. You'll see that same subject on all roofs, rubber, tpo, fiberglass etc etc. Sometimes they change with the temps.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.