Dave, from the giant 2465B discussion thread (
HERE), few points I gathered regarding your 2465B.
1. The leaking SMD electrolytic caps at the logic A5 board are known to be really nasty, desolder all of it now even you don't have the replacement yet. As the leaked electrolyte known to destroy the surrounding PCB traces. As yours is still working, you simply very lucky. Once desoldered, you will have to clean those nasty leaked electrolyte as its very-very corrosive.
Example of corroded thin traces surrounding the leaked cap at two different A5 boards at forum member's 2465B, also the corrosive liquid crawled underneath the components and destroyed traces, click to enlarge.
2. Those hybrid ICs at the big bottom board (called A1), are well known to heat up/thermal overloaded if the scope is powered on without the blue cover installed, put a fan blowing the whole bottom A1 board to cool them. The case is designed with those vent holes that suck air and blow directly at the hybrid ICs. Just don't power on the scope too long without that cover attached.
The special designed vent holes formations at the bottom of the case, where air get suck in and cool straight at those unobtainium hybrid ICs.
3. The Dallas DS1225Y, stores the scope's calibration, your TL866 writer supports it and can read the old one, and write the fresh one, and its still produced by MaximIC and named DS1225AD as the "Y" version is obsolete. This is another high priority work to be done asap, as the battery inside will die anytime.
4. The soft faint blink at all LEDs at the panel when any button was pushed, is perfectly normal, if I'm not mistaken, read it somewhere, up to certain serial numbers of Tek 2465B produced have this flaw, mine too has this problem.
5. Subject to arguments/debates, the vulnerable U800 chip, my opinion only, unscrew both nuts as they serve no purpose at all and probably may do more harm than good. I posted my arguments ->
HERE... not sure I've covered all for your scope, but there you go, hope this help, for the 2nd part of this video.
Actually, all of these above issues already covered and discussed in the giant 2465B thread, but I guess you won't have time to read it all as they're buried somewhere in there, and that thread grows almost 1.5K posts now.