Diagnosing and Replacing Failed Sod

Sod laid last year, not greening up this spring. The expert says treat as CSI: determine cause (environmental, biological, cultural). Follow-up: all dead, don't know cause, died at 3 months. The expert recommends ripping out, re-sodding. Rototill lightly, check for grubs (post holes), soap flush for insects, apply Milorganite, lay fresh sod tight, roll, water twice daily 2 weeks then daily 6 weeks, monitor seams, water morning/afternoon.