Ahoy Grizzlybear,
Years ago I read an article describing the properties of tube glue.
It stated that tube glue is composed of 2 principle elements:
The glue and the carrier.
The jelly-like substance is the carrier and it contains the glue.
The article explained that the carrier dried very slowly to allow
for proper postioning of parts and then after some time the
glue would go into effect. This is especially helpful for beginners
since as you may know liquid glue is very fast setting and
dissolves the plastic much more rapidly.
The bond of tube glue can be quite strong if used properly.
Using to much tube glue on a part would create some problems too;
the parts would not properly bond and what would actually hold the
parts together was just the dried carrier. Then surprize, months later
when you touched and handled the model, things would start falling off !!!
So start by gently prying the parts and see if they come loose. If they do,
then proceed to scrape off the excess carrier ; there should be minimal
damage to the plastic and repair as necessary.
Also try soaking the model in undiluted household bleach for 24 hours,
this apparently will loosen the bond of tube glue.
Good luck with your project !
Have a nice day and happy modeling,
Joe