SemiAccurate reports the chokes of some ASUS P43, G31 and 785G series motherboards ship with rusty covers. It's unknown whether this is just a cosmetic issue or a more severe problem that can cause stability issues or worse.
From what we know at the moment, this issue seems to be a local issue in Taiwan and Singapore, but it might be much more widespread than this. The issue that we’re having with it all is that any responsible company would pull these products off the market. Instead we’ve heard that Asus is actually dumping the pricing on the affected models we’re aware of to try to clear its inventory as quickly as possible.
The models known to be affected include the P5P43TD, the P5P43TD Pro (Intel P43 chipset), the P5G31D-M Pro (Intel G31 chipset), the M4A785-M and the M4A785D-M Pro (AMD 785G chipset). If you own one of these boards we’d suggest that you visually inspect the chokes for any signs of rust and contact your reseller ASAP if you discover any, as it should be replaced under warranty.