The pseudomonas bacteria could be an opportunistic infection brought on by an immune system compromised by another health issue.
Pseudomonas and bacterial lung infections are relatively common in snakes afflicted with OPMV.
However that's only a potential indicator. Pseudomonas are also seen in secondary infections associated with IBD, crypto, septicemia, scale rot, stomatitis and even with non-pathogen related stress issues (shipping, dehydration, mites, poor conditions).
In other words - the presence of pseudomonas bacteria can be expected in many illness scenarios.
Best of luck.