Here is a general procedure to lock the OMC in air to check ghost beams and so on.
We do not use the guardian in this method.

1. Stop all the FFUs in the OMC area.
2. Put the IFO in a single arm lock state
3. Center the OMC QPDs with OMC Dock -> Layman's pico screen.
4. Open OMC LSC screen from the OMC Dock
5. Increase the CLK_GAIN to 10000
6. Open the FB_FLT filter bank (K1:OMC-LSC_FB_FLT)
7. Turn on "-1", "gain", "LP400" filters.
8. Put "0.03" in the gain.
9. Turn on the input and output ON/OFF switches.
10. Open the OMC TRANS camera
11. From OMC Dock, open !ndscope -> LSC. Set the Y axis scale of the TRANS_DC_SUM to auto.
12. Move the PZT_HV1 slider (K1:OMC-PZT_HV1_OFFSET) slowly (with a keyboard) until you find a TEM00 resonance (check the camera image).
13. OMC should lock to the TEM00 automatically, though not so stable.
14. Make sure to turn on the FFUs after your work is done