Resistors are heating-up
Looking at a 25L6 datasheet the audio power amp output valve is rated in excess of 50ma (combining anode and screen grid currents). You can confirm this by looking at the voltage across the cathode resistor (R15, 180R) which may also be rather warm. 

That will form the bulk of the HT current, the remainder of the valves will take a few ma each (limited by R18? which is 3.3K).

Taking 50mA as the HT current, I make the power consumption in those resistors about 0.4W split between them : they should run warm, not hot.

Two possible suspects could be:


excessive leakage current in the main reservoir cap, C30A. This may have died, or it may simply need re-forming (connection to a current-limited HT voltage until it's electrolysed a new insulating layer; you can measure and watch the leakage current drop as it re-forms). A higher power higher resistance replacement for these resistors is one relatively kind way to limit current for the duration. A few minutes should show some progress, after a few hours it should be down to a couple of ma or less.
Leaky C38, pulling the 25L6 grid positive. This would be accompanied by a cherry red glow on the anode (plate) of the output valve.