SIA investigating allegations made by passenger on delayed Singapore-India flight

Singapore Airlines (SIA) said it is looking into a passenger's allegation that she and her fellow passengers were "trapped" on board flight SQ516 at Changi Airport for about three hours on June 8 without any air-conditioning.
Chandni Doulatramani wrote in a Facebook post that she and her family were flying home to Kolkata from Brisbane via Singapore.
She wrote that the flight was scheduled for takeoff at 9.10pm but ended up leaving at about 12.30am because of technical difficulties.
She described the experience as "traumatic" in a lengthy post.
We have summarised what she said happened below:
The flight finally took off and they arrived in Kolkata at 2am, three-and-a-half hours after they were supposed to arrive at 10.30pm.
[embed]https://www.facebook.com/chandni.doulatramani/videos/10160431698370023/[/embed]
You may read her full account here.
In response to Stomp's media queries, SIA provided the following statement regarding the incident:
"Singapore Airlines flight SQ516 operating from Singapore to Kolkata on 8 June 2018, experienced technical issues on the ground resulting in a 2 hour 52 minutes delay.
"We sincerely apologise for the inconvenience caused to our customers on board.
"With regards to the online post, we take these claims seriously and will be looking into them thoroughly."