I got on the patio roof and here's what I saw. There is what looks like white tape over the seams between the panels that make up the patio roof. One seam's tape is cracked more than a foot long and another about six inches long. When there is heavy rain, water leaks through the cracked white tape. How do I fix this ? I couldn't find a you tube tutorial. Do I re-tape? What tape do I buy? Where? How do I apply it? Thanks!--Anyone done this before? I called the one who installed the roof for the previous owner and he said I should replace the seam tape on all 6 seams--he will charge $245 with a 1yr warranty. What do you think? thanks!