Are there any things in ISO 9001 not covered by ISO 17025?

Although ISO 9001 requirements are very integrated into ISO 17025, as the approach and purpose are different (being  customer focussed),  you need to assess whether your compliance for certain ISO 9001 requirements is adequate. If your laboratory went straight to ISO 17025 accreditation, i.e Option A (not preceded with ISO 9001 certification) there may be gaps that exist. Depending on the extent a laboratory develops its QMS beyond the minimum requirements of ISO 17025, the level of ISO 9001 compliance differ. I suggest you do a gap analysis of your current QMS to the specific requirements of ISO 9001.

Look at the article ISO 17025 vs. ISO 9001 – Similarities and differences at https://advisera.com/17025academy/blog/2019/07/11/iso-17025-vs-iso-9001-main-differences-and-similarities/

Also have a look at the Advisera 9001 academy resources at https://advisera.com/9001academy/, which includes resources to assist, such as whitepaper Clause-by-clause explanation of ISO 9001:2015 and the ISO 9001:2015 Gap Analysis Tool.