Drilling additional small (1/2") holes above the level of the 4 inch holes accomplishes nothing.
Drilling additional small (1/2") holes below the level of the 4 inch holes will allow desaturation of the soil below the level of the drain pipes but only for a few feet radius around the pit. This is optional. A slight hazard exists that mud may enter the pit through these additional holes.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.