I been have problems with my right front speaker this past week. When I first turn the radio on, I sometimes hear no audio out of that speaker, and by turning the volume **** up a tad, it comes back into service?

Is this a common problem? Anyone here had this issue and what was your resoultion?

I don't want to take a shotgun approach to this .
I was thinking the amp may be going bad on that channel, or the lineout of the radio may be going bad?

I have a 99 GS300 , non Nacamichi.