Record: Venting date, schedule, air and casing readings, date pins appeared, late trays.
Check that white mycelium has reached the casing surface across the whole bed.
Squeeze casing from three places and note damp, wet or crumbly.
Write the schedule you chose, with target air temperature and hours.
Drop temperature and open fresh air together, then feel for dead corners.
Count the days to the first pinheads and mark trays that pinned late.