DotMM - Issue with secret doors

I purchased the Dungeon of the Mad Mage module and my party and I were going through it with little issue. Then one of my players noticed that if there wasn't diagonal lines touching an exterior wall, that meant there was a secret door there. I checked the Dynamic Lightning layer and sure enough, most of the premade dynamic lighting went slightly past the dungeon wall, revealing these diagonal lines on the map or just crisp black lines on the player's session if a secret door is there. Is there any way I can fix this without redrawing all the dynamic lighting for the dungeon walls?  

This has been brought up before in another thread . There's a good discussion of the issue there if you want to contribute. The posts there are aging, and it will probably auto-close soon without a new post, though.

Thanks! Guess I didn't search far back enough before posting my own thread. I will check it out