MacBook Pro overheating after being repaired
I'm unable to answer / resolve the OP query, but I wanted to share my similar experience. I've had a very similar experience in that I had a MBP 2011 15" GPU failure about 18mths ago, which resulted in the Main Logic Board (MLB) being replaced earlier this year. Since then I upgraded the OS to El Capitan - and the MBP heated up faster and hotter than it did prior to the GPU failure, and the fans didn't audibly start up as much or as loudly as they did before the GPU failure/ MLB replacement. The OP's temperature stats &amp; data were similar enough to mine to not warrant posting my own (plus i can't remember that level of detail! I then began experiencing similar GPU related symptoms (lines across the the screen etc) and I took the MBP to my local Apple Store, who replaced the MLB immediatley... since then I havent experienced the same high temperatures, however I still can't hear the fans kick-in when it does get hot...or somehow the new MLB replacement has somehow qietened the fans (although I can't see how this is actually possible). I've reported this to Apple Support, however there isnt a resoltion... arguably as there isn't a problem as such. I'm probably being over-concerned. 

AS such, I would recomend you contact Apple Support and get it booked into a Genius Bar asap alongwith a set of actions that can be carried out at the bar to replicate the high temperatures. Good luck!