After bait of random google I discovered that my card reader is identified as

Broadcom Corporation|NetXtreme BCM57765 Memory Card Reader (vendor:14e4 device:16bc subv:14e4 subd:0000)

If I’m correct and judging by (Lack of) details in the system information panel, the reason that it doesn’t work anymore is because Maverics doesn’t have a working driver!

If I’m correct then I don’t think the osx 11 update will contain a driver for it and ill be left feeling screwed.

Just a clue that may be of interest to other Macbook Pro users with failed card readers.