Right indicator light is on constantly.
 

I had this problem about a year ago, took it in to a mechanic he did something while I wasn't there and fixed it and he suggested that I replace the whole indicator stalk for a hefty sum.
It has been great for a whole year no problems and now out of the blue it is starting again. No matter how many times I use the left indicator it goes straight back to the right indicator. Is there a simple fix for this or should I take it back to the mechanic n get it replaced?