Provide new instructions about serious diagnostic scanParseword Answer

How to solve this Parseword clue

The clue resolves to redirect through the numbered wordplay changes below. Each step keeps the original phrase visible so the solution can be checked line by line.

1. Step 1substitution

   serious becomes dire

2. Step 2substitution

   diagnostic scan becomes ct

3. Step 3substitution

   about becomes re

4. Step 4charade

   re dire ct becomes redirect