Stereo mode in phone stage going out

I have a Pioneer SX-950 that had a near-complete restoration a few months ago.  The issue I had taken it in for was the stereo mode when playing vinyl would cut out on the right channel. Thankfully, the mono mode stayed intact.  Up until recently, all was well with stereo mode, but last week the same issue popped up again.  My question is: would purchasing a separate phono stage correct this issue?