In alt.home.repair, on Fri, 6 Sep 2019 21:05:31 -0700 (PDT),
wrote:

Thank you for the input Micky, trader_4, croy and grfe. The cold water flow is fine. My condo requires a licensed plumber to do this repair (else the condo association will not shut off the water to do the repair). Today the plumber found the cartridge's hot water side clogged with debris. A new cartridge fixed the low flow.

A decent resolution.

Thanks for getting back to us.