[David G4EBT]

The service sheet shows that there are eight electrolytic caps and seven tubular paper caps. Of the rest, (the 'flat' ones) seven are mica, and one is ceramic, none of which should be a cause for concern unless proved faulty. Of the resistors, 14 are 20% tolerance and 17 are 10%, so even when new, a 470K resistor say, could have ranged from 376k - 564K and still be in tolerance. Unless any are way our of tolerance and degrading performance, best left alone.