Slight snaps are not really normal noises. A frequent problem as these cars age is the convertible top transmissions. The is a plastic gear in each unit that can crack and/or split. These gears can be purchased at Pelican and the transmissions can be repaired. The price of the gears is fairly high but the repair job is quite straightforward. I did this job 2 weeks ago on my '04 and the top now works like a charm. Better, IMO, than replacing the transmissions with used from eBay.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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