Broken MicroSD slot on Raspberry Pi 3
https://raspberrypi.stackexchange.com/questions/63106/broken-microsd-slot-on-raspberry-pi-3

Micro SD card slot on Pi 2
https://raspberrypi.stackexchange.com/questions/45700/micro-sd-card-slot-on-pi-2

Corrupt SD card — guide Mon Nov 30, 2015 3:05 pm
https://www.raspberrypi.org/forums/viewtopic.php?t=127512

How to Repair a Broken Raspberry Pi SD Card Slot By Ktulu_1 in Electronics
https://www.instructables.com/id/How-to-Repair-a-Broken-Raspberry-Pi-SD-Card-Slot/