''Nail Pop" occurs on both sides of a deck. The expansion/contracting of the wood wicking moisture and then drying out loosens the fastener and allows for a small amount of rot around it.
If the panels are still good... you can check the level of rot... clean it up... add joist tape and reinstall the panels, but with screws that are larger than the current fasteners. Most likely replace the purlins and wrap those with the tape before securing.
The top decking can be fixed by a mixture of either deck grates or just replacing a few boards that take the pounding from drip off the roof.
(obviously joist tape what you can under those also).
Time and Mother Nature will rip down any structure.
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