I've seen a few open circuit failures of the 1500uF 15V capacitor in at least 2 of the counters from this series and some HP analog multimeters, other than that the others have been OK, a few of the small ones have been a bit tired.
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For gate light faults, I rebuilt a stripped 5245L using a pile of boards from varoius sources and made some to replace those I couldn't obtain, the pile of boards had quite a lot of faults, the gate light was stuck on with the board I had, a lot of the 2N708/709 transistors on one board were either open or shorted, makes you wonder what happened to it to cause that much damage.?
There is a thread here on the rebuild; https://www.vintage-radio.net/forum/showthread.php?t=205651
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David
factory