Use of "found" and "found to be"
Solution 1:
Found+adjective is a form often used in expressions like "found guilty" or "found wanting" (probably because findings are the outcomes of inquiries, trials, inquests and audits). "Found fixed" is therefore a little bit odd.
In your example 'determined to have been fixed/corrected' is more idiomatic and also removes some ambiguity about "fixed" (which also means unvarying).