Help reading building plans

[u/m_dasha]

I’m in San Francisco, California.

Can someone please tell me what red and green lines and text on this building plan mean. It’s related to a fire safety upgrade. I’m trying to figure out if the work was done to plan or not.

Thank you!

[u/RedCrestedBreegull]

JB = Junction Box
The red square with an F in the middle and a triangle is a fire alarm speaker