LAST day warranty not sure if I should let them pick it up!

Hi,

Today a tech came by to replace the cable of my lcd screen because they thought it was broken. After we replaced it the laptop didn't start still. The tech called dell and they are going to pick it up tomorrow for repair. The last chance too because today is my LAST day of warranty.

After he left I took it apart and put it back together again and it works perfectly now. I tried for 2 hours to get the problem back but it continues to work perfectly.

Should I let them pick up my perfectly fine laptop. Im so worried the laptop will give the problem again tomorrow when Im out of warranty. It has worked before like the problem was gone and had it come back again the next day.

Thanks,
Yme

Alienware M17xR3-12gb-7970M-SSD-2720QM