In the download section of the forum there's a Doblo eLearn, which is in fact the FIAT workshop manual. But I have no idea for which doblo generation is that.
At some time FIAT stopped releasing them on CDs/pendrives and moved it to an online access. Which of course is payed and then limited to professionnals only.
I'd try to look on ebay for manuals not related to the manufacturer (by Haynes, Motorbuch Verlag, Bucheli Verlag). I've got their manuals and are quite happy with them.
Then, this FIAT website is (probably only) temporarily online, it is having access problems sometimes, but also can be a good source for information about the van.
The diagrams and drawings are not showing properly, using Chrome / Egde allows them to be automatically downloaded. A little bit complicated, but there are a couple of ways to deal with. It's all described in this dedicated thread.