Here in the UK, Keysight offer a repair service, but if the equipment is maybe 15 years old or more, they often return the equipment unrepaired and declare it beyond economic repair or declare that the failed parts are obsolete. This usually happens if the PSU fails. I think Keysight can only offer module level repair on PSUs if the PSU is made by a third party such as Coutant-Lambda.
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I think that this is because they probably don't want to repair (down to component level) a third party PSU that is not their own product. So once the PSU module is declared obsolete by the third party manufacturer, it becomes harder for Keysight to repair their own equipment.
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I think the same applies with Tektronix, although Tektronix have a very aggressive support strategy here in the UK whereby if you don't pay into an expensive support contract (for that instrument) every year, they will either walk away or charge a ridiculous flat fee to even look at the instrument if it ever fails. Often their initial fee estimate is more than the cost of buying the same instrument model from a dealer, especially if the instrument is 10-15 years old.? A typical repair estimate might be ?10k to ?15k for a 15 year old spectrum analyser. This effectively makes the instrument uneconomic to repair and it gets earmarked for disposal.
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