I'm not 100% sure if the following (as the pictures I took of my VTA board the last time I used it (2+ years back) are not too clear), however I am sure that the following resistors have discoloured (gone darker) a little:
R19 / R20 / R21 / R22
Could this be from heat or is this an indication of some problem perhaps? Again I must stress not 100% sure if they HAVE discoloured since I last used the board, or perhaps these 4 resistors were from a different brand. But now it's set up again and sounding great I want to make sure it's all running smoothly.
EDIT: I believe all resistors on this revision of the VTA board (high-gain, purchased 2007) are 1/2 watt types.