The PSB is open Monday through Friday from 9-11:30am and 1-5pm. The number for visa-related emergencies when the office is closed is (0871) 63166191 or 087163197353.
The website link provided here doesn't link/connect for some reason.
The new Visa office is located at 118 Tuo Dong Road. There is no number on the building yet so do not bother to look for it. There are 2 passport photo shops on either side of the building. The office is located directly in front of the Kunming Museum. The bus stop is named - Shi Bo Wu Guan - Bus 1, 62, 109, 117, 145, 213, A1 and K3 stop directly in front of the office. Foreigners need to go to the 3rd floor. The Tuo Dong Stadium is located to the right of the office while Baita Road is located to the left of the office.
The address and the map was updated
The address has changed last week to a new (all different types of entry and exit services) building at Tuodong Road. Im sorry I dont remember the number exactly but Im almost sure is 118. Its a quite big and brand new building.
They have the directions about how to get to the new office at the door from the old office. Its a bit of walk, about 1km.
The service is not so bad and english is well spoken there. Bring copies of your passport, chinese visa, entry stamp, address registration (original and copy) and picture. 160 RMB for 1 month extension paid when its ready. Service done in 7 days. The new visa will be valid from the day you applied and you can hand it out at the expiration date, the latest.