iv lost the code to my ford rds 7000 eon. stero ?

hello please can you help iv lost the code to my rds 7000 eon stereo iv tryed the code 2872 but it just come up wait for 30 mins then gose code im on the 5 try now if any one can help please. for i use my car to transport desabled children and the sound of the sereo is some time all thay have thank you