Need advice please

I recently purchased a Nakamichi PA-7II amp.  I already have one and wanted another to expand my system.  I paid $2000 for it.  Looks nearly mint in original box.  However, I have a crackle from the left channel when playing music at low volume.  It is in fact coming from the amp determined through process of elimination and by switching out components.  Estimated cost to repair the issue is only between $100-$200.  I have always thought that this particular amp was Nak's finest and is becoming the most rare to find these days.  I have an opportunity to return it to the seller.  Is it worth keeping and getting repaired?  Thanks for your opinions.