Check Constraints Changed In 6.5->7 Conversion

When our DB was converted from 6.5 to 7, the some column check constraints changed
to table constraints.

Is there a way to change them back, short of rebuilding the table? I can't find a syntax
to add a column constraint without adding a column. Some of the affected tables contain
millions of rows, so I'd rather not rebuild them.

When I create a test table with a column and a table check, I see that in sysconstraints
"colid" and "status" are different, and in sysobjects "info" and "status" are different. I
am leary of tweaking the database catalog though. Heck, this is SQL 7; I don't even
know if these are real tables or mirages.

create table zzzfoo (
myname char(30) check (myname in ('foo', 'bar')),
myfuzz char(30),
check (myfuzz in ('cotton', 'wool', 'linen'))
)

select sc.* from sysconstraints sc, sysobjects so
where sc.id = (select id from sysobjects where name = 'zzzfoo')
and sc.constid = so.id and so.type = 'C'

constid id colid spare1 status actions error
----------- ----------- ------ ------ ----------- ----------- -----------
1380915991 1364915934 1 0 133140 4096 0
1396916048 1364915934 0 0 133156 4096 0

select * from sysobjects
where id in (select constid from sysconstraints
where id = (select id from sysobjects where name = 'zzzfoo'))

name id xtype uid info status base_schema_ver replinfo parent_obj crdate ftcatid schema_ver stats_schema_ver type userstat sysstat indexdel refdate version deltrig instrig updtrig seltrig category cache
-------------------------------------------------------- ----------- ----- ------ ------ ----------- --------------- ----------- ----------- --------------------------- ------- ----------- ---------------- ---- -------- ------- -------- --------------------------- ----------- ----------- ----------- ----------- ----------- ----------- ------
CK__zzzfoo__myname__524F1B17 1380915991 C 1 1 6 0 0 1364915934 Sep 8 2000 4:29PM 0 0 0 C 0 10 0 Sep 8 2000 4:29PM 0 0 0 0 0 0 0
CK__zzzfoo__53433F50 1396916048 C 1 0 4 0 0 1364915934 Sep 8 2000 4:29PM 0 0 0 C 0 10 0 Sep 8 2000 4:29PM 0 0 0 0 0 0 0

TIA