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I'm sorry, it's a m2540dw. Replaced the main pwb on 10/15. F21b back again today, 10/19.
I was sending a fax and someone came up and tried to scan 1 page and the f21b popped up again.

Randomly getting cf21b error when scanning. Have had 70 occurrences of it over the last several months. Firmware is up to date, can scan to any pc while another is continuously pinging it. Have...