How to get the output using PROC MIXED for residual error to check for normality?

I am using proc mixed for my analysis (RCBD), but don't know the SAS code for outputting the residual which I can use for checking normality. Can anyone help me with the SAS code?

The code I'm using is:

proc mixed data=A;
class ID trt depth block;
model LogNO3= trt| depth;
random block ;
lsmeans trt;

I read sth abt using outpred and outpm, but I don't know where and how they should be placed in the statement above.

Would be glad if sbd could help me with this.