Held is a boolvalue object
object.Held.Changed:Connect(function()
print("changed")
if object.Held.Value then
print(object.Held.Value)
object.Trail.Enabled = false
elseif object.Held.Value == false then
print(object.Held.Value)
object.Trail.Enabled = true
end
end)
nothing prints and nothing works

3 comments
Still nothing prints, but held.value does change
" Held is not a valid member of Part"
Change it to a lowercase h because I think Held is a property of the part