Can no longer print using CUPS

I have a Brother_HL_L3270CDW_series printer which worked out-of-the-box, was detected by Ubuntu 22.04 over WiFi and could print immediately. It stopped working and I don't know why. With cupsctl --debug-logging , here are is /var/log/cups/error_log when the printer has been removed using Ubuntu settings app (apologies for the masses of repetitions -- a short, filtered version is at the bottom): D [29/Oct/2022:11:38:06 +0100] cupsdSetBusyState: newbusy= Active clients , busy= Not busy D [29/Oct/2022:11:38:06 +0100] [Client 69] Server address is /run/cups/cups.sock . D [29/Oct/2022:11:38:06 +010

Question by spraff on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.