Digital Output #1 to 4 on T100MD888+ are controlled by the output driver ULN2803A to the right of the output terminal. The IC 74HC595 to the left of the output LED 5-8 is also responsible for driving the status LED and the signal to the ULN2803A and this may need to be changed if the damage to ULN2803A is too severe.
Digital output #34 is controlled by the IC TPIC6A595NE. This is a Texas Instrument part number and is available from some component stockists such as Digikey.com