Found another filter that needed changing mainly due to age degradation, the pump exhaust filters. Installed those today, then calibrated the temp of the guns per the manual.
370 deg Celsius at lowest setting.
The new to me 470s temp wouldn't adjust up past 400 deg Celcius, so pulled a working board out of a parts unit. I'll try to fix the original board when I get time.
Two completed Hakko desoldering stations. Calibrated and fresh filters, rebuilt pumps, massive vacuum. These things really suck!