1999 Saturn Sedan problems with the transmission

The transmission in my 1999 Saturn recently started giving a "bump" or "Lurch" while driving. It only does this every now and then (sometimes only once every 3 or 4 days, and then 4 or 5 times during one drive. A friend put a computer device on the car and got a readout of PO 133, PO732, PO 741, Can you tell what that means and can it be fixed without pulling the transmission out. I also changed the filter and fluid on the transmission after the first two times it did this but did not notice any change.