C123 is right on - after ten years start thinking it over. With quality gear like your Levinson I wouldn't get paranoid about the large can caps until about the 15 year mark. My ex runs a unserviced, 21 year old Hafler DH200 that's still cranking as new into large Advents. A few years back I replaced the 12 year old large can caps in a Threshold S300 and noticed no real performance change. However it felt good to know they were done. Some cats hype boosting the total capacitance and modding to a faster rectifier bridge. But being a keep-it-stock kinda guy, when the next time comes I'll do what I did before: source the closest OEM equivalents, unscrew the old ones and slip in the new. For now if your amp is working right it sounds like you'll be OK for a while yet.
