Using of "from what of"

Solution 1:

This form is not idiomatic in its expression. The idea is that:

• elements of this product were tested
• not all the elements of this product were tested
• problems were observed in the elements of the product that were tested

There are three main errors in this statement.

First, 'what' implies certainty. If you say 'I want to do what I love', it implies that you already have a notion of what it is you love and that you want to do just that. This is different to saying 'I want to do something I love', because 'something' implies a lack of certainty - that you are open to possibilities and that you are not fixated on one thing. In the statement, it is unclear how 'what' is used; it may imply that the components tested were not defined or it may imply that they were defined.

Second, 'what of' modifies 'product'. If you want to refer to a subset of something bigger, it is better to use a definite noun, e.g. 'elements of the product', 'components of the product', 'bits of the product' etc., instead of 'what of the product'. This is more idiomatic.

Third, the sentence is saying that, when the product was tested, problems were observed. One cannot say '...there are problems' (meaning problems are currently present) simultaneously with '..product we could test' (meaning the testing took place in the past), because presumably, problems were observed during the testing, and if so, both clauses should be in the past tense.

Better statements could be:

We found problems in the product elements that we were able to test

We found problems in the product components that we tested

If you now wanted to say that these problems are still present, then this should be done as a separate statement. E.g.

We found problems in the product components that we tested. These problems are still present in our product.