It beginning to look like all roads lead to the USPS. No new equipment that I know of at the USPS, however, they are in the midst of changing their processes, which, may, or may not, have an unintentional side effect. They are closing sortation facilities around the US and consolidating them to other sortation facilities. Without getting in to too much detail, here's what's happening:
Under the old traditional USPS model, most sortation facilities actually sat empty throughout most of the day. Mail trucks would arrive in the late evening, sortation employees would work through the night to have the mail sorted and ready for dispatch/delivery the next morning. Then employees would leave, and the facility would sit empty again, until the next evening.
Under the new model, typical mail delivery would be retarded by 1-day. Sortation facilities are staffed with sorters and machine operators 24/7 (by transferring many from other closed facilities). Trucks deliver the mail to the facilities, where the sortation process now is taking place throughout the day, as well as at night. This results in the maintaining of fewer facilities, better use of their workforce, and millions in reduced operating costs (theoretically).
However, this also means that mail sorting equipment that once ran for 8 to 10 hours a day, is now running virtually 24 hours a day. Could it be possible that the added run-time and machine-stress causes that equipment to run much hotter than usual? I don't know, but, I'll poke around and see what I can find out.