Levinson No. 23 mods/updates

Some time back (several months??), I saw someone advertising for sale a Levinson No. 23 that had been "updated" to some different value resistors in part of the circuit and replacing some capacitors that are subject to heat damage being near the resistors.

While I don't recall the specifics, I seem to remember the implication was this change was a known issue with the amp and it was a improvment over the original design.

Can anyone shed some insight on this question?