Pretty sure Road and Track in Ipswich QLD do them. They do a fair bit of work for interstate customers from memory. They are on Facebook and have their own website.
Could be a short or a bad earth. From memory, they do both use the same flasher relay. Unless you are handy with a multimeter/electrical circuit testing, I would suggest an auto electrician.
In that case, disregard my previous reply. I was thinking door mirrors.
There should be 3 wires, constant 12V, switched 12V and earth. Pull out the sunglasses storage trim and you may have an unused harness in there.
No reason for the attitude mate, just trying to help.
I think I may have misread the question, are you talking about door mirrors or the rear vision mirror?
These forums have a search function, please use it.
http://au.toyotaownersclub.com/forums/topic/15501-parker-lights/
http://au.toyotaownersclub.com/forums/topic/34244-how-to-change-the-fog-light-bulbs/