You can find out the shutter count on your camera by uploading a recent picture here:
Check Camera Shutter Count and Manufacture Date
I love my K-5IIs, but have my eye on a KP (preferably) or a K-3 (secondarily). The K-5 family has an estimated shutter life of 100,000 clicks. The KP is the same. The K-3 is rated at 200,000. If you shoot a bazillion pictures and your K-5II is getting a little long in the tooth, that might be something you want to consider. I've read that some people's results are considerably better or worse, so these numbers are only a rough guide. You can see a side-by-side comparison here:
Pentax K-5 II vs. Pentax KP vs. Pentax K-3 - Pentax Camera Comparison - PentaxForums.com
I've never had any repair work done, so can't help you there. No doubt others will.