Arrived at a home goods store in Vacaville California for approved HVAC repairs. On arrival, checked in with vendor log and store manager. RepairedRTU 4: Removed failed VFD. Installed new VFD. Found VFD not operating correctly. Called NexRev. Confirmed my wiring was correct. Continued to troubleshoot problem with NexRev. Found two parameters were not programmed correctly. Went through and programmed VFD to correct settings. RTU 4 is now fully operational. Repaired RTU 1: Removed failed DrivePak card. Installed new DrivePak card. RTU 1 is now fully operational. Checked out with EMS and onsite management.