PIP query

Hi. My husband went all the way to tribunal for his DLA to PIP transfer and was refused and given no points. He has Bipolar Affective Disorder, sleep apnoea, chronic renal failure and asthma. What I am wondering is, does anyone know if the DWP look at previous decisions when an application is sent in? We have had carer's and severe disability premiums removed from our ESA award (I'm disabled too), and are really struggling financially. Going through the tribunal affected my husband's bipolar very badly, so I don't really want to put him through the process again, but I feel I have no choice. I would be grateful to hear from other people who may have been refused at tribunal, but applied again and were successful. Thanks.