Originally Posted by McKBrew
The only real option you have here is to draw off part of your mash water, heat it up and pour it back in and then just mash a little longer. I don't have software handy right now to tell you what temp to heat it up to.
This should work fine. I had to do this a few times with my crap old MLT, had no issues with the final product.
I'd look into why your temps fell so fast, did you account for the fact that the grain would lower your temps? Did you preheat the mlt?