This section turned out to be loaded with empty rooms and just 2 monster groups, neither with lairs. Since both monsters were very large, I decided to place multiple exits to the surface here. Being level 7 this works well as it will allow higher level characters to bypass the easier levels so they can get right to the challenging areas.

Room contents
0731 Empty
0801 Invisible chest attached to ceiling holds: 24,000sp, 1500gp, Jewelry worth 1100, 2500, 6000gp. Opening drops contents to the floor – hit anyone underneath? Loud noise?
0802 Manticore, no lair, 2 per 3 PC
0803 Empty
0804 Empty
0805 & Headed Hydra (no lair) 8000sp, 2000gp, Map to 20000sp
0806 20000sp,1500gp – Hidden under trap door in floor.