I'm at Subway in Singapore https://t.co/6mREqNd8wf
East Region
[{'url': 'https://t.co/6mREqNd8wf', 'expanded_url': 'https://www.swarmapp.com/c/afRK8M3JxWe', 'display_url': 'swarmapp.com/c/afRK8M3JxWe', 'indices': [27, 50]}]
CHANGI AIRPORT
["i'm", 'subway', 'singapore', 'https://t.co/6mreqnd8wf']
[]
subway
subway singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to public housing or maintenance issues."},
    ]

It seems that the Twitter post you provided does not relate to a maintenance report feedback to public flat house in Singapore. The post simply mentions "subway Singapore" without providing any further context or information. Therefore, the answer is that the post does not relate to a maintenance report feedback to public flat house in Singapore.