Db9 noisy oil pump

[Marcus121]

Hi guys not sure if anyone has ever encountered this but I have a noisy db9 oil pump , it's an 06 with low miles and I can hear a screeching sound when pulling away and a buzzing/whiring sound when at idle, I've changed the oil for new and it's slightly improved but still there, it's defiantly the oil pump (I've checked and double checked). Please if anyone has experienced this and has any ideas I would be interested, I noticed quite a few air bubbles in the oil when I drained it so it's possible that air is getting in the oil? It's worth mentionng that I have my undertray and wheel arch liners removed at the moment so perhaps because there missing it's making the sound more noticeable but trust me it's quite bad sounds just like a screeching fan belt when I pull away, such a shame as the v12 sounds awesome at all other times any advise would be greatly appreciated.