Mark Levinson - refurbish or start fresh

I have a couple of old Levinson pieces...335 amplifier and 380S preamp (and also a 39 CD) that have been in service since 2000 or so...almost always on for the duration...and reliable performance until the 335 went flat.  Technetron is Levinson certified and will fix/refresh the amp...cost dependent on whether they have to replace the large caps.  They could also refresh/refurbish the 380S...but it wasn't clear to me that it makes sense to mess with it until it fails.  (Perhaps it is failing, but gradually so that I haven't noticed.). 

I'm interested in the pros and cons of fixing/refurbishing vs going back out on the market for newer equipment, whether Levinson or otherwise.  Thoughts on either piece welcome.