Believe the Amtrak P32's can enter/exit GCT via the center two track tunnel(Mains 1 and 2),they cannot be sent in/out the
2 single track tunnels(Mains 3 and 4).
In a NY Times article,Amtrak is planning on 44 days worth of track outages.
Fair use Quote,per regs:
"Commuters Groan as Amtrak Plans for 44 Days of Penn Station Repairs"
"The plan presented by Amtrak outlines 21 repairs and their locations.
But it did not explain how the work will affect train schedules during track closings.
The work plan appeared to indicate that at least 2 track at a time would be
closed off during the periods of July and August."
Amtrak with NJT and LIRR are still hashing the plans out at this time.
National print edition did not show what's to be done.