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As it's been stated in many threads, many times, only replace resistors that are out of tolerance, WHAT that range of tolerance is generally up to the tech, I prefer to replace ones that are %15 or more out, some say you can get away with %20, and YES, sometimes there is errors in the SAMs, but this is rare,
and it's always good to replace a few parts at a time, and test to see if you broke anything.
MY method for replacing resistors is to find the target area on the SAMs, locate the resistors there listed, and if they are out of tol, replace, and as Electronic M said, make sure what you are checking matches what is on the SAMs via color code, AND, when replacing, I also measure what I am putting in for extra safety, I want to make sure the new one is correct, ( IE was made wrong or defective )
You can't check and re-check too many times...
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