Today, 3783E was on it's correct shift for this week, 17E, the
242 to 179 x-over.
There are only 17 shifts for 242 (1A - 7A, 8P - 14P, 15S, 16S, 17E)
That means there are only 10 scheduled buses. If you exclude 539P,
you will get 10 buses.
The 7 A/P shift buses will rotate among each other (3755L
included)
276Y will be on 15S
3783E & 3863H will operate 16S & 17E on a weekly
rotation.
So from Weekday 32 timetable to the Weekday 33 timetable, 1 S shift
bus has been "promoted" to A/P shift. Previously the last shift was
16E, the 179 x-over