[Crist Rigotti]

You could simply add tubes' currents, would be enough for calculation.
Looks like 45mA is fairly conservative, so total dissip is 0.5W.
So 2W resistor would be enough. This goes for 235 Ohms one as it dissipates 90%. The 32 ohm can be under 1W.

PS. As long as the resistor checks OK, no matter how it looks, clean it and leave it be.

Wow, that was simple.  A lot less wattage than I thought just by looking at the one that is in there now.  I'm going to clean it then leave it alone, but I'll get a couple of resistors just in case.  

Thank you.