Is that right ducatiboy?
Peugeot gearboxes use a different grade of oil to most other car gearboxes. What quite commonly occurs is that if for example a driveshaft or clutch is replaced (meaning the old oil is drained from the box), the oil gets replaced with the incorrect grade. This then leads to gears being difficult to select and the synchromesh not working properly, especially when cold. Draining the incorrect grade of oil and filling with the correct Peugeot specific grade most of the time cures these problems as the designed clearances in the synchromesh then work properly once more.
Peugeot gearboxes, be it MA or BE type all DO have a drain plug situated on the bottom of the split casing for the diff, a breather plug at the top and also a level plug on the side of the 5th gear extension housing.
So I suggest it is YOU who needs to "get a brain" and stick to talking about things you know about, and leave things you OBVIOUSLY DON'T know about to others.