Can you correct this email for me

Dear Mrs. xxxx,
I thank you for your help. Your intervention {or "assistance"}* was helpful. My statement of marks transcript** is now available {or "has now been updated"?}now. The Administration corrected the mistakes.
Respectfully yours with sincere gratitude,***

*Intervention sounds a little strong, but okay. We would usually say something like "thank you for your assistance, or "thank you for your help."

**«Relevé de notes» => (academic/course) transcript

***It's a little redundant to have both "Respectfully yours" and "With sincere gratitude". Either one will work. In a business or professional context, I would suggest using just "Respectfully" or "Sincerely" (no "yours")