Here's my version of the amendments 
Service 51: Extended to HGN via Hougang Ave 2 & Upp Serangoon
Rd
Service 132: Extended to HGN via Hougang St 21, (Hougang Ave 1),
Tampines Rd, Hougang Ave 7, Hougang Ave 5. This service partially
replaces the current route of 327.
Service 151: Extended to HGN via Hougang Ave 2 & Hougang Ave
10.
Service 321: Extended to SGN & Integrated with 328 to form
Service 101. [Serangoon - Buangkok Crescent (Loop)]
Route: Serangoon Central, Upp Serangoon Rd, Upp Paya Lebar Rd, Lor
Ah Soo, Hougang Ave 1, Hougang St 21, Upp Serangoon Rd, Hougang Ave
2, Hougang Ave 10, Hougang Ave 4, Hougang Ave 8, Hougang St 51,
Buangkok Green, Buangkok Link, Buangkok Cres, Buangkok Link,
Buangkok Green, Hougang Ave 4, Hougang St 51 (Loop)
Service 322: Integrated with 327 to form Service 118. [Hougang
Central - St 92 (Loop)]
Route: Proposed Route by SBST of Service 112.
Service 326: Divert to operate from HGN [Hougang Central - Hougang
St 21 (Loop)]
Route: Upp Serangoon Rd, Hougang Ave 8, Hougang Ave 6, Hougang Ave
10, Hougang Ave 2, Hougang Ave 3, Tampines Rd, Upp Serangoon Rd,
Hougang St 21, (Hougang Ave 1), Tampines Rd (Loop)