98ha

Hi All, I got a Honda accord 98 ex, there's a problem with the power lock, I can unlock the front passenger side but can not open with power control on the driver and passenger side. The power control can open all the doors just not the front passenger side.
I had a same problem before the rear passenger side, But I got that fix from dealer, they replaced the actuator assembly.
Could this be the same problem with the front passenger?
Please help and how to replace the actuator, I got door panel off now, but do not know how to replace it.