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还是一下这个原因：-Yes. USCIS needs to get the duplicate of PERM (Labor certification) from DOL and it takes time. So, it is impossible to make a decision within 15 days. That is why your employer cannot use premium processing for your downgrade I-140. It seems your lawyer has no much experience about downgrade of I-140.

Premium Processing Service is available for the Form I-140 classifications indicated on the chart above provided that the case does not involve:

• A second filing of a Form I-140 petition while an initial Form I-140 remains pending;
• Labor certification substitution requests;
• Duplicate Labor Certification requests (i.e., cases filed without an original labor certification from the Department of Labor),-Yes in your case. and;
• A Form I-140 petition in which a final decision has been made.