OK, so I added another filter to the reporting sub:
DoCmd.OpenReport ("AllSamplesReport"), acViewPreview, , "[pvmt_analysis_section_id] = " & Me.cboSectionNo " and [pvmt_sample_nmbr] = " & Me.cboSampleNo
pvmt_analysis_section_id and pvmt_sample_nmbr are integers.
I keep getting syntax...