1999 Honda Accord

The code po700 is a generic code telling you that the problem is in the transmission.
Code po730 is a trans convertor lock up problem.
Thins to check for are
1) connection on trans convrtor lockup solinoid
2) lokup solinoid itself for short or malfunction
3) check the trans fluid for metal fileings du to worn internal parts. If you have filelings change your trans fluid, somtimes these fileings will contaminate your sensor. More thane likely the problem will be a poor connection or faulty sensor.

Good luck andrew