Existential sentences that used to be but are no longer
I'd suggest you adding some time information in the front to emphasis the fact it is in the "past" as that is definitely unambiguous. 


以前 有兩個不好的部份...
之前 有兩個不好的部份...


Alternatively, these ones can also be used. They means "originally", which implies "in the past, and now changed"


原本 有兩個不好的部份...
原來 有兩個不好的部份...