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From: "UFO" <tech@parts-link.net>
Newsgroups: sci.electronics.repair
Subject: Leader LBO-518 CRT Scope Y axis drift
Date: Thu, 23 May 2024 16:37:09 -0400
Organization: i2pn2 (i2pn.org)
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Picked up this as a donation yrs ago, mostly in good shape only its got Y 
axis drift, which seems to settle down on warmup after a long time.

I posted to EEV blog in 2023, but no responses.
https://www.eevblog.com/forum/testgear/leader-lbo-518-scope-y-axis-drift/msg5127711/#msg5127711

Someone on another forum said electrolytics on the input boards for each 
channel could be
high ESR, so I guess thats the next thing to check?