If it's not already clear, in the table the defective part is highlighted with red, and the replacement
| Existing sensor: | Existing Indicator: | Defective part replaced with: |
| Defective: 879 wind sensor. | 879.5, 879.521 or WSDI(-1) | WSS 550/750 wind sensor + WSI interface box |
| 879 wind sensor | Defective: 879.50, 879.521 or WSDI(-1). | Whole system replaced: WSS 550/750 + XDi-N Wind incl. NX2 |
| WSS+WSI | Defective: 879.50, 879.521 or WSDI(-1). | XDi-N Wind incl. NX2. Directly connected to WSS. (WSI not needed) |
| WSS | Defective: WSDI-2 | XDi-N Wind incl. NX2 |
| WSS | Defective: WSDI-2+NCI-1 | XDi-N Wind incl. NX2 |
| Defective: WSS/WSS-L | Any | WSS 550/75 |