You mean the door to the outside back in the pillar room? So the party is splitting up?
The lantern only casts light within 30' (I messed up with the light indication going 60' above); you'd have to move more north to see what's up there. However, Si'Nat indicated he was searching the room for secret doors and treasure so I assume you'll traverse the room anyway...
The room turns out to 120' N-S. In the northern end are the crumpled forms of three more hobgoblins and four goblins and they seem to be in various states of disarray - a couple are half out of bed, some are half dressed with bits of armor, a couple seem to have been heading south towards you with weapons in hand before they fell asleep.
The room has plains wooden bunks along the wall and two tables with long benches in the center. There's a door in the north wall.
The armor is basically leather and shields, the weapons swords and shortswords.
The hobgoblins had pouches containing gold and silver, the goblins just silver. The total amount found is 16 gp and 99 sp. One of the hobgoblins (one of the ones that attacked) also has a keyring with two on it.