Clay flue liner is missing

[Eklmn]

have a brick chimney that contains three flues inside.

They are connected to
-oil heater in basement
-fireplace in basement
-fireplace on first floor.

The chimney sat down and had a big vertical crack that was repaired by previous owner. Due to the move some clay flue liners cracked down and fell apart. I do not use fireplaces, but heater is important for me.

To be short the oil heater's flue is missing on the first floor so that I can smell CO (sometimes). Through the fireplace window (first floor) I can see the broken/missing heater's flue. Looks like I can reach it with my hand. Only one piece is missing.

Questions:[8)]
-can I install new flue liner myself without professional?
-if new flue pipe can not go through the fireplace window, can I cut it in half vertically and then put together inside?
-where can I buy 'Clay flue liner'?
-how much it could be to have it installed by professional?

I can post some images if it helps.

Thanks.
Ek

[imeduc]

Pull a S/S steel liner through it. is the best way to go.
might look at http://www.hickorymountain.com/obliners.html

ED

My mistakes dont define me they inform me.

[Eklmn]

Can I use S/S steel liner only in the place where clay is broken or
I should pull it all the way from the bottom to the top?
I have only one tile broken (2 feet?).

Thanks for comments.
Ek

[imeduc]

All the way from bottom to top. If some is broken the rest will go also.

My mistakes dont define me they inform me.