How to Clean Up Orphaned Data?

Gallery URL = http://jacobmcdonald.net/gallery2/main.php
Gallery version = 2.3 core 1.3.0
API = Core 7.54, Module 3.9, Theme 2.6, Embed 1.5
PHP version = 5.2.6-3ubuntu4.2 cgi-fcgi
Webserver = lighttpd/1.4.19
Database = mysqli 5.0.75-0ubuntu10.2, lock.system=flock
Toolkits = Exif, Getid3, LinkItemToolkit, Thumbnail, ArchiveUpload, Dcraw, Ffmpeg, jpegtran, NetPBM, Gd
Acceleration = partial/21600, partial/21600
Operating system = Linux eddie 2.6.28-15-server #52-Ubuntu SMP Wed Sep 9 11:34:09 UTC 2009 x86_64
Default theme = matrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)
Rows in GalleryAccessMap table = 192
Rows in GalleryAccessSubscriberMap table = 17135
Rows in GalleryUser table = 6
Rows in GalleryItem table = 17129
Rows in GalleryAlbumItem table = 455
Rows in GalleryCacheMap table = 43

When running the Build All Thumbnails function I see a ton of output that doesn't really make sense to me. So I ran the Integrity Check, and it spit out this:

Checked 52201 entities
Orphaned data in table AccessMap with no row in AccessSubscriberMap table; ids: 77276, 77277, 77278, 77279, 77280, 77281, 77282, 77283, 77284, 77285, 77286, 77287, 77288, 77289, 77290, 77291, 77292, 77293, 77294, 77295, 77296, 77297, 77298, 77299
Path component /var/www/jacobmcdonald.net/gallery2/g2data/albums/vacations/album177/album178/Thumbs.db not connected to any item

I have phpMyAdmin installed and am capable of navigating the database, but I need some pointers on how to start. Could someone let me know where to start digging in order to get to the bottom of this orphaned data?

Thanks!