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After the normal restoration work, I've seen resistors drift too. On a Zenith I did a resistor would only drift when voltage was applied during operation, heat/cold did not affect it. Upon troubleshooting and locating the suspect, with my meter set to Ohms I immediatly checked that resistor right at power off and sure enough, drifted back to value.
You are not doing yourself any good replacing parts that will "most likely" be okay.
Gotta' have a little fun diagnosing and finding problems too you know!
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