Video Editing of Existing Mv4 file

I have a 5+ hour learning workshop we recorded, however the title slide that is presented in the first 1 minute, 36 seconds is INCORRECT. I need someone to replace the visual slide for the first 1:36 seconds with the correct slide (see links below) WHILE KEEPING THE AUDIO INTRO INTACT. Additionally, the rest of the video file MUST NOT BE lower in quality (audio and video) than the current version you see in the links below. I need this today! Link to the Full Video: [login to view URL] Link to the Correct Intro Slide Visual: [login to view URL]