Tower Transit Singapore Bus Service 77, SMB3020H

I decided to head down to Marina Bay to watch the National Day combined Rehersal. Naturally, it is quite understandable that no boarding or alighting is allowed at Marina Center Bus Terminal and the last bus stop for Marina Center bound buses is the Pan Pacific Hotel. However, as there are NDP Rehersals ongoing, the route has to be slightly diverted and it becomes clear that it will become a loop service...and as the day goes on, more bus stops will be closed to facilitate the NDP Rehersals.
Before I had boarded this bus, I believe the video has captured another Demonstrator Bus, and if you had seen the video and guessed the model, its the 3-Door MAN Lion's City (A95) Demonstrator, SG5999Z running on Tower Transit Singapore Bus Service 143.
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Bus Manufacturer: MAN
Bus Model: MAN NL323F Lion's City (A22) (Batch 1)
Bodywork Design: Gemilang Coachworks
Bus Operator: Tower Transit Singapore
Bus Route: Service 77
Bus Registration: SMB3020H
Type of Bus: Production Batch
Location: Opposite Mandarin Hotel
Destination: Pan Pacific Hotel
Date: 8th July 2017
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[@justrichard1910]

Where is SG5999Z I don't see it before you board the bus

[@KagamineStudios]

Its at the very back