How to change VP-540 IC Cartridge Sensor (Reader) inside Slot

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I have a VP-540 that has 2 broken IC Cartridge Sensors inside Slot 3 and Slot 4 of the Ink Cartridge Slots. I attached a picture of the sensors that I need to replace. There is no manual on how to change them out and just need some pointers on what to take off first so I can get the sensors replaced.

 

[Cheezer]

I have a VP-540 with two bad heads, otherwise fully operational and in good condition, which I would like to get rid of. I'd make you a heck of a deal!