The solder staying within the holes and finding a way to get it out properly
Finding new pads for the LEDs
Pins breaking off the switches upon removal
Copper inserts coming out along with the switches
Probably either of these :
+ Your soldering iron is not hot enough
- You should wait until the soldering iron reach to the per-defined temperature before going to desolder another switch. Usually, the soldering station has a red-led, if it is blinking, it means the soldering iron is not ready, you should wait until the red-led is off before soldering/desoldering.
- You should set the soldering iron hot enough to desolder the lead-free solder joins. For lead-free solder, the temperature should be around 350-400 C degree.
+ The contact between your soldering iron is not so good
- You should use or add a bit of solder to the switches before touching them
- Please make sure the contact area between the soldering tip and the switch is large enough to transfer heat, you can try a different type of tip like chisel tip 2.4mm
+ Your soldering pump is not strong enough
- Please make sure you have a good and solid soldering pump, otherwise the solder will get stuck
- Please make sure the contact point between the pump and the solder join is close enough when desoldering
Possible solution for the problem of solder staying within the holes:
- You can try to add a bit of solder back to that hole and desolder again