I lifted the hood on the 2004 V70 to "just look". Skip that idea. On all the other volvo's I have owned 240 thru 850, they had an assessible plastic screen to replace. I have not been able to locate a picture/skematic of the oil trap on the V70's so cannot answer these questions...... but since you have gone to the edge of the Volvo universe, maybe you know !!!!
How similar is the v70 oil trap configuration to the old models???? and how it is plumbed??? What did you actually have to repace??? filter screen???
Now that you know how it is configured and what "needed to be replaced or cleaned............ do you think that disconnecting (?) a hose to the trap at a more assessible location ??? and back spraying it with some WD-40??? would work??? Does the design allow for cleaning?????
Bottomline: Do you think there is a simpler approach...... knowing it might not clean as well as what you did, but....................
Thx.