In my first PFL I they asked for a lot and I mean a lot, to name a few they asked for 3 years back t4’s from CRA, some other CRA document that was very detailed, they asked for bills, accounts, insurance plans, landlord reference letter….. I don’t remember all. then the second one they mentioned a CBSA officer went out to look for me but I wasn’t at the address listed so they don’t believe I live with my spouse and they said the relationship wasn’t genuine…. they had my address wrong because I’ve never gave them that address on any paperwork, they mentioned a few other things I dnt quite remember but my lawyer and I submitted a bunch of documents and proof of our relationship and that we never gave that address and then the officer called to say she understands and gave me AIP.
edit: the second PFL came with an interview for both applicants, after we sent in PFL our response was satisfied so officer cancelled interview.