If there are problems with the capacitors on the backplane or on any cards, the life of the replacement PSU will be severely limited. The capacitors, if failed, will add a significant load (short circuit) to the PSU, causing it to work harder and fail sooner.

If you're not able to change the capacitors, you need to find a local tech who can wield a soldering iron and change out the capacitors on the backplane and check the capacitors on all the cards. Failing to do this will result in the same short life of the PSUs.

Cheers,

Steve

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5k.2C, DSP33, F80
Spare: MCD, 100 Series, 200 Series, 500 Series, C15s.