An E-trigger is the Tippmann Board, not an actual trigger.
There is no reason to put a paintball gun in a refrigerator, or any appliance for that mater.
You should check the dwell on the gun. Alot of times the gun will attempt to shoot faster then it can, therefore making the solenoid and bolt have to catch up.
You cannot replace the trigger buy itself but you can buy a new trigger with new trigger frame like in the related links:
Disassemble the gun, and replace the back cap with the stock or take it to a paintball store, and ask them to.
No, it will work with the standard bolt.
Have a degree in chemistry. Do not put anything in your gun besides air-tool lubricant (for mechanical guns), or actual paintball lube.
its all personal preference, try out other guns that have different triggers and see what you like. Almost all types of triggers are made for the Mini.
you screw the adapter into the gun, and then the co2 cartridge.
not nearly as popular as the vs2, the problem with the 3 is that crazy rocking trigger they put on it. it teaches bad form and is no faster than a standard trigger
it depends on the model.
most likely a valve oring in damaged.