LISP Routine to change one block with multiple tag values?

Looking for a lisp routine that will change one block with multiple tag values; iow, I have one block that will have multiple tag values that need to be changed to new values.  I need a routine that will allow me to change the block with the tag value 10-1 to abc, the same block and tag value 10-2 to def, so & sf.  The routine will need to search the tag value to determine what the value is and change it accordingly.  Also need it to work with a scr file........I had this routine on an external hd that decided it doesn't want to work anymore.

HELP!!

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