Thanks for sharing your query.
108% achievement at 7.7 mets indicates low exercise tolerance that means at 7.7 mets patient is getting 108% achievement (minimum 85% achievement is required in TMT)
Altough whole TMT is uneventful but positive means ST segment down slopping in defined leads.
You should go for 2 D echo and coronary angiography
for detail analysis of heart arteries.
All the best,
Dr. Mayank Bhargava