Most likely the conductor plate is starting to go.
It's a DIY for about $140 ( NOT including a new filter and fluid($$$$$$) ) ( Google NAG1 conductor plate, shucks even Amazon has 'em )
On the DIY 1-10 scale, it's about a 6.
On the messy 1-10 scale it's a 9.
If you have access to a lift, it's a 4-5 on both scales.
If you don't have access to a lift, JACK STANDS are mandatory. ( You have been warned )