Stripped Transmission Pan Threads
So I noticed the other day that the transmission pan looked a little wet, a quick wipe with a rag and sure enough some red fluid was dripping out. Today I decided to drop the pan and replace the fluid and reapply the RTV sealant. As I went to remove the bolts, a few bolts came out easier than others, at first I though the dealership had just not tightened the bolts to spec, however after putting everything back together I noticed I wasn't able to torque the bolts properly. Looks like the threads have been stripped.
I was wondering what is the best way to fix this? I know I could tap a slightly larger screw diameter and use the corresponding screw, however is that the best method? or is it better to use one of the repair kits from time-sert or helicoil, anybody with experience with either?
Thanks for the help.