[Pidgeonpost]

I've occasionally had trouble using 'search' on my mobile. If you try Googling 'DPF regeneration Volvo forum' you'll get several hits, though whether they offer opinions on drilling out I don't know.
From what I've read, the car does a pretty good job of regeneration automatically, so maybe get the current status of the DPF read first - unless you already know it's constipated? I'd very wary of drilling holes or otherwise interfering with it. Plenty of places offer DPF cleaning these days, but maybe find out if you have a problem first?