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If resistance reads lower than designed on these old carbon comp resistors it almost always means there is something in parallel with them affecting the reading (those resistors usually aren't a problem but you could unhook an end if you're concerned), but if the resistor reads higher than specified by a percentage higher than the tolerance rating to means that the resistor has gone bad and needs to be changed...
Carbon comp resistors usually fail by increasing in resistance. And there is no way external parts in a set that is powered off can make a resistor test as a higher resistance (only lower).
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