Issue with GWR Electric Suburban Trains?

[whole diary]

[Timmer]

Is there an issue with GWR^▸ (Great Western Railway)’s 387 fleet? Heathrow Express also not running

Alterations to services between London Paddington and Reading

Due to more trains than usual needing repairs at the same time between London Paddington and Reading.

Train services running to and from these stations may be revised. Disruption is expected until the end of the day.

Customer Advice
We're sorry for the disruption to your journey today. Due to more trains than usual needing repairs today, our local stopping trains between London Paddington and Reading will run with less carriages than normal. We understand this may cause your journey to be less comfortable than usual and we do apologise for this.

Customers are strongly advised to use our high speed long distance trains between London Paddington and Reading where possible. Customers travelling from London Paddington to Slough, Maidenhead and Twyford are strongly advised to use the Elizabeth Line between London Paddington and these stations. Tickets will be accepted at no additional cost. Westbound Elizabeth Line services depart from platform B at Paddington. This can can be found in the Elizabeth Line station located adjacent to platform 1.

Heathrow Express:

Due to a significant incident outside of our control, there are currently no Heathrow Express services running. We are actively working to resolve the issue as quickly as possible.

[IndustryInsider]

There’s an issue with the couplers on some units due to a wrong part being fitted at overhaul apparently.  Risk of problem is minimal but cautious approach being taken until check have been made.

[Chris from Nailsea]

Thanks, IndustryInsider.