Help with old school Manitou FS-TI fork
I was commissioned to tune up my friend's mountain bike recently (1997 Barracuda A2E). I fixed up the drive train and the shifters, which were his main issues. I found the manual for his fork online and asked him if he wanted me to scope it out, even though it would be my first fork service. I thought, at least, that I'd change the oil and lube the seals.
Everything looked good on the inside, and I put it back together. The compression and dampening seem fine, but the springs are making a "ping" sound under load. I don't remember the fork being noisy, but I can't figure out a way that I could have caused it. The pinging happens equally at minimum and maximum preload. Any ideas on what it might be?