68k + 10%
68k + 6.8k = 74.8k
So 76.7k
may be out of spec if you are using an expensive and accurate ohmmeter, however it is unlikely that it is, and even if so that it would seriously effect the circuit - there are simply too few places where such a difference wouldn't be within the tolerance of the circuit (or they would have originally fitted a 5% or 1% component, and they don't).
Measure a known new one(s) of any values(s) and see if they all come up reading a bit high. If so, relax. If not we are talking a fraction of a cent - replace it.
Audio circuits just ain't that critical, +/-20% or more would still cut it fine.
