Hacking washing machine PCB

[Michuw81]

Hello members, 

I have bit unusual question. 

I have Smeg washing machine (I know is made by Beko) with a steam refresh program and auxiliary function (the steam is added at beginning of the was cycle) I like to hack the chip from PCB to add equal sequence at the end of those cycles (after spinning) where steam auxiliary function are selected.

Is anyone have any experience with this and can direct me where to start please. Or it is any way to get inside programs and modify them?

I will be grateful for any tips.