well your on the right track
code 33 is defective transistor drive
and code 49 indicates pump motor wire breakage according to the troubleshooting guide.

code33 possible causes:
1) wire break in T1P
2) faulty drive board
3) faulty CS3 current sensor
4) faulty logic card
5) faulty wiring

code 49 possible causes: basically the same
1) wire breakage in pump motor
2) faulty CS3 current sensor
3) faulty logic card

i'd recheck the power cables
recheck the sensor wires
check all harness plug pins and make sure they are inserted completely in thier respective sockets

try the wiggle test to see if you get any variation in vom readings while checking, you might also want to do a volt drop check on those wires and cables, not a continuity check.
if they are corroded or have bad crimps on the terminals this can cause problems like this.