Small Engines (Lawn Mowers, etc.): poulan chainsaw, oil holes, oil tank

Question
I have a poulan 2275 20" chainsaw that the auto oiler for the chain stopped working, how do i get at it to see if it is plugged.  Any suggestions you have would be appreciated.

thanks

Answer
take the bar off and check the oil holes in it ,then check the passage end at the bar,and if it still doent have oil use a piece of wire to pull the hose out of the oil tank gently and replace the filterand if that doesnt work then the pump needs to be replaced