Repairing Analogue Inputs on Uno?
If the Analog input of your Arduino Uno is damaged, then unfortunately you have damaged the pins on the ATMEAGA328P chip directly. 

As per the schematic below of Arduino Uno R3, the pins A0 to A5 are connected directly on the Pins 23 to 28 of the ATMEGA328P chip.

 

Therefore if you say that the 2 out of 6 Analog pins have been damaged then the only way to fix that is to replace the ATMEGA328P chip with a new one.

More can be read here about the UNO's hardware design.

PS. When replacing the ATMEGA328P chip, be sure to program the new chip with the Arduino Bootloader so you can upload sketches to it, otherwise it won't work ;)

Cheers!