According to MiceAge:
Daytime testing of Disneyland’s new Monorail Red is off until later this week at the earliest. The suspension issues aren’t that big an issue, but visitors were complaining as they were waiting for the lone operating train to come back, while a shiny new one zipped by unused. CM’s tried to explain, but hotel guests in particular were still unhappy they couldn’t ride on what looked to be a perfectly good train. In light of concerns and short tempers at both stations, and some complaints at the hotel’s front desks, daytime testing is off until they are certain they are only days away from getting the new train signed off.