A paint job, and restoring the internals. All caps renewed. New speaker posts. The amplifier was upgraded with new low-noise op-amps. One unit had a defective transformer, it made a quite loud humming noise. A typical fault with these amplifiers, and many got changed on the warranty back in the day. I replaced it with a 300VA toroid.
A legendary amplifier, as seen here driving a pair of Revox BX-4100.
