How to change an allocated reason in OFS?
Correcting a downtime reason after the event, either directly in the Events Chart or with the Edits Tool.
Reasons get corrected for all sorts of ordinary situations: the wrong one was picked in a hurry, or nobody could get to the screen at the time.
There are two ways to do it. The first works for any OFS user; the second needs an Administrator or Analytics User with Editor role. The Events Chart can be opened from the Console (the EVENTS button) or from Analytics.
OFS Console:

Analytics:

Option 1 — Change the reason in the Events Chart
Available to any OFS user. No special role needed.
Step 1 — Select the span and press Update

Step 2 — Select the category

Step 3 — Select the reason and press Update

Option 2 — Change the reason with the Edits Tool
You need an Administrator or Analytics User with Editor role for this route.
Step 1 — Open the line
If you opened the Events Chart from Analytics, select the line you want to edit first.

Step 2 — Turn on the Edits Tool
Press the pencil icon in the top right corner.
Step 3 — Select the span and press Update

Step 4 — Press the pencil icon

Step 5 — Select the category and reason, then press OK

What to expect afterwards
The change is recorded in the Edit Log against the span, with the login that made it, the time, and the reason it was changed from and to. Corrections are traceable, not silent.
If the stoppage should really be split across two reasons rather than reallocated to one, see How to allocate multiple reasons during a downtime.