Hi all, I purchased my Retra LSD last year and I only used it once, I carried it with protection bag, rinse it with clean water and stored in electronic dry box after use. But recently I found out there are many scratches/marks with regular pattern on the LSD top glass (please see attached photos). At first I thought it was fungus/mildew growth inside the top glass, I contacted Retra and they ask me to send the LSD back for inspection. But after their inspection, they found out the scr