Please help me with a purchasing decision

I have an opp to buy a Levinson 23.5, it will be replacing  a 431 that I have. 
The seller of 23.5 is not near me so audition is not possible. Is there anyone who owned both of these amps and share their experiences please? 

Is is there something I need to be aware off about 23.5?

Many Thanks in advance. 
It's pretty old, but I guess you're aware of that. I might need work and Levinson service is costly.