Need some help with a power master 256

[Tallguy64]

Hey all,

I got a oldie but goodie pm256 this is more for technical help then anything. It has been working great up till a couple days ago when I was cleaning off the plasma table scraps and it decided to die out. I thought it might be arc gap so I opened her up and they were a little dirty cleaned her up fired it up with the case of and no pilot arc. I can see it arcing across the points but after a few seconds it thought the red light on the front. I have tested the stick and tie and they are both working but no plasma. I found what looks like a burnt out resistor. It is labeled 15 2r7. Any idea what the resistance is supposed to be and or is it possible to get a replacement bored for this unit still?