Best not restrict replies in the way you have. Many issues affect all versions of the E38, so keep it open if you need help. Remember that a slightly updated version of the M73 engine was used as the M73N in later cars too...
The 750iL has comfort glass (double glazed) as standard, and is occasionally wrongly referred to as 'Bulletproof' which it is not. Bullet resistant glass was fitted to Protection cars which of course are pretty rare-its very unlikely you have one of these.