Tek 1741 removing faceplate / replacing the scale illumination light.

[gorplop]

Hello,
I've recently picked up a tek 1741 PAL Waveform monitor/vectoroscope combo in a rather sorry condition (very dirty, came with a half of the rack enclosure because some muppet cut the rack with an angle grinder).

I'm unable to find the service manual for the vectorscope sadly.

I've adjusted the focus and trace rot on the CRT (the pots on the CRT board are labeled), so signal wise it displays sensible data.

However, It still has three issues..

- First, the scale illum knob doesn't do anything, the scale is not illuminated at all. I can see the illumination bulbs (?) PCB on the left hand side of the CRT (see photo).
- Second, theres some dirt between the CRT protector pane and the graticule.
- Third, the UN CAL led is ON all the time, do I need to run some calibration software (if there's any)?

How do I take off the front panel in a safe way so that I can test/replace the bulb board and clean the graticule?

Thanks