LOL Danny, a slippery slope I am all too familiar with
Shutter count 1317, downloaded manual from Nikon, time to read.... I asked the seller how much it was used, he replied that it took great pictures but he only used it a couple of times, much preferred to whip out his iphone to take pics.....
1317 is nothing :-)
have a look at http://www.olegkikin.com/shutterlife/nikon_d90.htm
jj