This is the Nichicon Upgrade service. If you have an old RetroGameCave PSU from 2020 or later and the PSU is the square-flat style as pictured, then you can upgrade your classic edition to Nichicon edition.
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How to use this service.
Purchase the service X1 for each PSU to upgrade.
You will receive the ship to address within 12 hours or less.
Ship your PSU to RetroGameCave.
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RGC will replace all electrolytic capacitors with brand new fresh Nichicon Capacitors and then apply a new fresh label with the Nichicon Label appropriate for your PSU and ship the unit back to you.
 
Tip: Buy multiple and once and save on shipping costs both ways.