It is very unusual for capacitors beyond the power supply itself to fail. It is VERY usual for capacitors within the (switched mode) power supply itself to fail/alter in value after about 3 years (or less if your unit is located where cooling is poor).

It is possible to repair the power supply by replacing capacitors within it, but the supplies are so cheap to buy new (with a three year guarantee which XP Power are very good about honouring) that you would be mad to do so - or have far too much time on your hands and be looking for something fiddly to do - fiddly even with a desoldering station. I have done it but more for entertainment than anything else. Do set the 5v line to 5.2v as already advised. You cannot assume it is factory set to that.

Cinema/Music: Trinnov Altitude32 8-16,218,Cloud 4 channel, Marantz UD5007,DSP5200SE(2+C),DSP3300(4),DSW(2),271,MShort Ceilings,AppleTV 4K
TV: Marantz SR7013 Wharfedale Diamond 9x4+Celestion(C)
Music: Roon,i7NUC8gen,QNAP TS253A, Sony Scala, MS200, Garrard DDQ650,Wharfedale Diamond 12.3
Kitchen: AD88 (bluetooth via i80).