If Jim is right about R-68 {I have not looked at the circuit}? we should be worried about R68 wattage.? As Jim says.

A related thing;? when these were produced, what was the rated temperature rise and rated ambient temp used in the standards? And what is it now?? In general it seems that replacement resistors are now smaller in surface area, so they must run much hotter ?than originals, which also means that they will tend to over-heat neighboring components if allow to run hot .