Stained note (Dead Money)

Stained note is a paper note

Location
It can be found on a desk in a second-floor room in the far northeast corner of Puesta del Sol North, accessible only through a broken hole in the wall above a courtyard filled with the Cloud (the Cloud may have been cleared if the Courier has reactivated Puesta del Sol's ventilation systems at the Puesta del Sol switching station already).

Starting from the door to the switching station, turn south and jump on the left hand pipe. From its end, jump onto the overlapping roof and follow it east, past the courtyard with a dead tree and a hole in the right hand wall. Continue eastward on the roofs until reaching the cloud-filled courtyard, with the hole located right up ahead. Switch to the right hand roof while avoiding the two bear traps, and enter the hole to find the note on the desk.