By contrast, 26 electrically operated passenger-loading bridges, refurbished and brought over from Stapleton Airport to DIA when it opened, only require about $3,800 in maintenance every year, and apparently show no signs of needing near-term replacement.
Turns out (no surprise here) that the hydraulic bridges were bought from the lowest bidder. Please note that the issue here is not hydraulic vs. electric; the issue is the peril of buying solely on price.