The procedures for applying to APC should be a Repeat Order on your Unit Part Ones. I will have a look on Monday for you if you don't get the definitive answer over the weekend.
You basically just sign a form saying you give permission for them to release them - something to do with the Data Protection Act - and get your HR* to send it to APC with a covering letter. They normally take about 2-3 weeks to come through.
*See the way I sneaked "HR" in then, instead of "Them workshy bastards in the orderly room"??
The only report on JPA for soldiers are those who have had a report since earlier this year since the first reports on line with JPA were WO reports 30 Jun , followed by CSgt/SSgt 30 Sep etc etc. The maximum anyone has on JPA at present will be one. Either way the SAR will grant you access to your reports.