The temps are about normal, some are on the high side but not by much.
I would guess your system is likely dusty inside. A can of can'ed air a small soft paint brush to scrub the fan blades and heat sink fins is all you'll need here after popping the bottom cover following this IFIXIT guide: {[guide|9665]|MacBook Pro 15" Retina Display Mid 2012 Lower Case Replacement]. Just be careful here as you don't want to damage your system follow good ESD protection practices as in the winter with the dry air it's a system killer.
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As far as the trackpad: Have you tried clean it with some isopropyl alcohol? Slightly dampen a paper towel and tried just wiping it down, The trackpad surface is glass so I doubt you damaged it just from regular use. They do get dirty from the skin oils and other junk that gets onto them. Replacing the trackpad is not something I would recommend you try in this series as its a very big job. Best to bring your system into an Apple Store and let them do it if its that far gone.
The temps are about normal, some are on the high side but not by much.
I would guess your system is likely dusty inside. A can of can'ed air a small soft paint brush to scrub the fan blades and heat sink fins is all you'll need here after popping the bottom cover following this IFIXIT guide: {[guide|9665]|MacBook Pro 15" Retina Display Mid 2012 Lower Case Replacement]. Just be careful here as you don't want to damage your system follow good ESD protection practices as in the winter with the dry air it's a system killer.