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Billywilly92,
One of your steering FET's may be blown. Look into replacing them. If that doesn't do the trick, then you could either have blown driver transistors(for steering P-channels) or blown I/O positions of the main micro. You could troubleshoot this with a meter to be sure, but if you're not electrically inclined, then replacing parts is the only option. Work your way back from the FET's to the main micro.

Nubius,
You don't have a robust enough power supply to do your testing. If you're only drawing 1.8A, but your PS is dropping from 6V to 1.5V, then your PS is not "gutsy" enough to handle the load. Carefully use a power supply consisting of cells(preferrably NiMh). A way to troubleshoot is to remove suspect parts and then monitor power consumption. Take a FET off the board, then connect power and monitor. If the board is still drawing considerable amounts of current, then try taking the other FET off. If the "power hogging" stops, then you know the last part you took off is your culprit.
The black box shaped thing, near the input of your FET's, is a driver transistor(NPN). It's used to aid the either the N or P channel FET's in switching(can't remember which). If you've replaced the FET's and your problem still persists, then yes, these transistors could be your problem.....either that or the I/O channel of the main micro is blown. Sometimes, depending on how the short cooked the IC's, the faulty current can trace all the way back to the main micro(IC1). Good luck changing those transistors though. I remember them being quite the chore to change out.

Josh