Noisy bearing in my new Ipower GM3506 gimbal motor

Hi,

My new Ipower GM3506 seems to have a bit of a “scrapey” sound as it rotates. This is in addition to the normal whine of the cogging etc. How do i open it up to either oil or replace the bearings ?

Could be my imagination, but on the back, it looks like two tiny grub screws with the hole filled with solder.