Autobox leaking from unknown bolt

On my lightweight hybrid, running gear is '86 Range Rover I'm told. It has the 4 speed auto box. It's developed a small leak from one of 2 Allen bolts, between the gearbox bell housing and the sump section (hoping the pics have attached ok)

Before I undid these, just wanted to know if anyone knows what they are first.... Is something spring loaded behind it? Or an adjuster of some sort?

Its leaking from the one next to the pipe

Thanks all...

After hours and hours of searching, found it from http://workshop-manuals.com/landrov...rbox_zf/fault_diagnosis/zf_automatic_gearbox/
It looks like they're blanking plugs used for diagnosing faults, remove these plugs and insert a pressure gauge

Just got to find a sealing washer now for it...

Your research beat me to it!

They are pressure ports!

Thanks
Managed to remove said bolt and reinstall with a crushable washer.... No more drips

Sorted....