I know that this weekend there are NO F Trains between Jay Street and Church Avenue meaning that the F train IS NOT stopping at 4th and 7th Avenues in Park Slope. There are shuttle buses, however. Here's what it says about these other lines:
and 
possible delays due to necessary maintenance work
Until further notice
Due to necessary maintenance work customers may experience 5 to 7 minute delays
from the times listed in the published timetable.