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awk to substitute third column if first column is greater than interest

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# 1  
Old 02-12-2013
awk to substitute third column if first column is greater than interest
A file
Code:
2400  2800  PSC000289
3200  3896  PCS000289
3333  3666  PCS000221
222    1000  PCS000222
3299   3600  PSC000289

Code:
Question is while if third column is  PCS000289 
and first column should be greater than 3000, then replace PCS000289 by YES,
remaining the others column same.

Code:
the output file should be
2400  2800  PSC000289
3200 3896  YES
3333 3666  PCS000221
222    1000  PCS000222
3299 3600   YES

Code:
awk '{if (($3="PSC000289") && ($1>3000)) {gsub(/PSC000289/ ,"YES")};1'}  <file

but it is not working? any guess.
# 2  
Old 02-12-2013
Code:
awk '$3=="PCS000289"&&$1>3000{$3="YES"}1' file

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