Probably easiest to just post the CK's own report here:
PATHFINDING: Navmesh 00051747 Cell 'FortGreymoor02' (000352C7), Triangle 259 Edge 1 and Triangle 260 Edge 0 should be linked, but they are not.
PATHFINDING: Navmesh 00051747 Cell 'FortGreymoor02' (000352C7), Triangle 260 Edge 0 and Triangle 259 Edge 1 should be linked, but they are not.
PATHFINDING: Navmesh 00051747 Cell 'FortGreymoor02' (000352C7), Triangle 260 Edge 1 and Triangle 261 Edge 0 should be linked, but they are not.
PATHFINDING: Navmesh 00051747 Cell 'FortGreymoor02' (000352C7), Triangle 261 Edge 0 and Triangle 260 Edge 1 should be linked, but they are not.
PATHFINDING: Navmesh 00101d1c Cell 'Wilderness' (00008E59) (6, 28) in WorldSpace 'Tamriel' (0000003C), Triangle 39 Edge 1 and Triangle 497 Edge 0 should be linked, but they are not.
PATHFINDING: Navmesh 00101d1c Cell 'Wilderness' (00008E59) (6, 28) in WorldSpace 'Tamriel' (0000003C), Triangle 497 Edge 0 and Triangle 39 Edge 1 should be linked, but they are not.
PATHFINDING: Navmesh 00101d1c Cell 'Wilderness' (00008E59) (6, 28) in WorldSpace 'Tamriel' (0000003C), Triangle 39 has a link to Triangle 18, but Triangle 18 doesn't have the matching link
PATHFINDING: Navmesh 00101d1c Cell 'Wilderness' (00008E59) (6, 28) in WorldSpace 'Tamriel' (0000003C), Triangle 497 has a link to Triangle 39, but Triangle 39 doesn't have the matching link
PATHFINDING: Navmesh 000fb3ec Cell 'FortSungardExterior01' (00009A9B) (-18, -7) in WorldSpace 'Tamriel' (0000003C), Triangle 419 Edge 2 and Triangle 421 Edge 0 should be linked, but they are not.
PATHFINDING: Navmesh 000fb3ec Cell 'FortSungardExterior01' (00009A9B) (-18, -7) in WorldSpace 'Tamriel' (0000003C), Triangle 421 Edge 0 and Triangle 419 Edge 2 should be linked, but they are not.
PATHFINDING: Navmesh 000fb3ec Cell 'FortSungardExterior01' (00009A9B) (-18, -7) in WorldSpace 'Tamriel' (0000003C), Triangle 419 has a link to Triangle 421, but Triangle 421 doesn't have the matching link
PATHFINDING: Navmesh 000c2521 Cell 'Wilderness' (00009286) (-28, 25) in WorldSpace 'Tamriel' (0000003C), Triangle 192 Edge 1 and Triangle 483 Edge 0 should be linked, but they are not.
PATHFINDING: Navmesh 000c2521 Cell 'Wilderness' (00009286) (-28, 25) in WorldSpace 'Tamriel' (0000003C), Triangle 483 Edge 0 and Triangle 192 Edge 1 should be linked, but they are not.
I think the majority of these can be fixed by refinalizing but a few need to be manually adjusted, I think.