Thank you guys for the replies. I admit I have not read the report in detail, most only here; I will correct that. One reason for my curiosity is I instruct on the a/c type and am always interested to find out how/why pilots screw up. It makes for educational input into any training.
Question still remains. On an NPA approach, above minimums, not visual why would any sane pilot disconnect the automatics? There should be one pilot looking outside and one inside. Preferably PNF is searching for the visual reference and PF is monitoring the instruments and flight path. If this didn't happen and PF disconnected to go 'scud running' then it brings into question SOP's and airmanship. The latter is already under scrutiny, the former is in writing.
Perhaps I am mistaken and the disconnect came below MDA; even more scary and disturbing.